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Assassin - Acolyte of the Veil is a solid MC feat (Druids might find Stealth tempting, and a 1/enc teleport fills a gap in the Druid's mobility, as they don't get many teleports).  It also opens up Venom Hand Master, which is useful if you have a lot of poison attacks, the Coiled Serpent PP, and/or a Staff of the Serpent.  Sky blue for such poison-centric builds.

Avenger - Everyone likes to poach their class feature, and you actually have some stat synergy.

Cleric - You share an attack stat, and Sentinel's might want to pick up Healing Word feats with Cleric as a pre-req.  Some people interpret Battle Cleric's Lore (D400) as working with the M/C feat, and if your DM is one of these people then Cleric M/C becomes sky blue, possibly even gold.  An unconditional +2 shield bonus patches the ruling that Druids can't use shields in beast form quite nicely, even making the Swarm Druid more playable.

Fighter - Battle Awareness is an excellent MC feat in its own right, but this also gives Druids access to Polearm Momentum which, thanks to the Alfsair Spear, they can use with Savage Rend.  Con Druids may also want to pick up Wary Fighter (use Wis instead of Dex for Initiative), but only if the overall bonus is greater than that provided by Improved Initiative.

Invoker - You share an attack stat (Wis) and one of two secondaries (Con).  Diversify your controller repertoire.

Monk - Probably the best M/C option for a Wild Shape Druid (assuming you're not going for Polearm Shenanigans).  An encounter useage of Centered Flurry of Blows makes the entry feat worth it.  Ki focuses are nice if you want to pick up some weapon attacks from HotFK.  For even more fun, pick up a Transcendent Ki Focus as your Superior Implement to get reach with your melee attacks (you give up an accurate implement, but reach is a tactically potent option).  An Abduction Ki Focus is a great enchantment since it gives you slide 1 with your MBA's so you can either increase Savage Rend's forced movement capabilities, or tack Savage Rend's slide onto Grasping Claws to get the best of both worlds.  The Radiant Fist PP also gives the Druid a place in a party abusing radiant shenanigans.

Poisoner (D373) - This "multiclass" allows you to ignore poison resistance, which could be very useful for striker types that picked Coiled Serpent as their PP. 

Ranger - A good alternative to skill training, since you'll get some conditional bonus damage to boost your striking prowess.

Rogue - Predators might want to look into this, but given the Rogue's very specific weapon requirements I wouldn't try to poach any powers off of them.  Possibly blue for spring Sentinels.

Shaman - This is hands down the best M/C option for Sentinels, especially if you want to maximize the amount of critters you have on the field.  The stats synergize well, and Spirit Talker provides great control.  Mending Spirit is a superb MC feat, granting you a 1/enc use of Healing Spirits and significantly boosting your capabilities as a leader.

Adroit Explorer (PHB2):  What class doesn't like this PP?  An encounter power of your choice, an attack bonus against the first enemy that bloodies you, and resist 10 all when you spend an action point is a solid starting package.  The utility lets you reroll a failed save with a bonus, you can spend a healing surge (it's an encounter power, to boot).  Finally, the Daily allows you to use one of your encounter powers as an immediate reaction when an enemy bloodies you (without expending the power). 

Blightbeast (D373):  Predators won't get as much out of this PP, because it has both features and powers that key off of Con.  You gain necrotic resistance while in beast form, and your beast form attacks also deal extra necrotic damage equal to your Con (making this a fine striker-focused PP for Guardian and Swarm Druids).  When you spend an AP, adjacent enemies can choose to get out of the way or take ongoing damage equal to your Con mod.  At 16th level you can ignore necrotic resistance in beast form, and enemies without necrotic resistance gain necrotic vulnerability (5) when you hit them (in beast form).  Yep, this PP definitely has impressive damage potential.  These damage boosts notably apply to all beast form attacks, not just melee attacks, so Swarm Druids rejoice in the devastation that your AoEs will sow!  The encounter power isn't anything special, it's essentially a necrotic version of Savage Rend with a daze effect.  The utility is a great mobility boost though, as you can move your speed + Con while in beast form, and you take half damage from any melee attacks (OAs) that damage you during this movement.  Combined with the Primal Swarm class feature, expect to be mostly unphased.  The Daily is a bland single target slide that deals ongoing damage, and enemies that start their turn adjacent to you take 5 necrotic damage.  Fortunately the rest of the path is so good.

Primal Summoner (PrP):  Usually a better choice for a summoner than Pack Lord.  The features are all great: your summons get an attack bonus to their instinctive actions and regain HP when they use them (less useful in Epic if you pick up Primal Summoning Expertise), and when you use an AP you can give a standard action command to a summon as a free action (Pack Lord's feature was similar, but only let you give a minor action command).  At 16th level whenever you take a move action, your summon can also move its speed (best part: it doesn't say "you command your summon to move its speed," it just moves.  Thus, they can still use their instinctive action after moving!).  The encounter power is only ok, granting your summons a damage bonus against the target.  The Utility is a stance (rare for a Druid) which gives your summoned creatures an attack and damage buff with all attacks except instinctive actions.  Very limited use in Paragon, but once you get Primal Summoning Expertise it becomes useful.  Not surprisingly, you get a summon power at level 20, but it's kind of an odd (though effective) one.  It switches forms constantly, even bouncing back and forth between medium and large size.  Its attacks have a built in shift though, so only on rare occasions will this summon not deal damage instinctively (it's also party friendly).

Blood Moon Stalker (PHB2):  Not a bad choice for striker-focused Druids; the attack powers are pretty sub-par (they offer no control), but the features are nice: free MBA when you use an AP, free action second wind when you kill something (pick up Vital Form even if you're not a Dwarf!), and at 16th level you can crit on a 19-20 in beast form.  Thanks to the utility power (and the MBA with an AP), this PP provides impressive nova potential for Druids, which is usually their biggest weakness as secondary strikers.

Coiled Serpent (PrP):  This PP is a strong choice, especially for striker-focused Druids.  The poison resist and stealth bonus may or may not be useful, but dealing ongoing damage with a successful AP attack is excellent, especially if you target multiple enemies (they all take the damage).  At 16th level, you get a significant damage boost (2D6 additional poison damage to all melee attacks in beast form).  The encounter power is a great grab attack, provided you're ok with it turning into a normal grab after 1 turn (and therefore not worth sustaining).  Instead of an escape penalty, it grants a direct +5 bonus to all defenses, which also aids in survivablity (plus attacks that miss you automatically hit the target).  The utility is an encounter power with a 3 square shift + concealment (nice!), and the Daily is an impressive enemies only area burst 2 that targets Will.  Your modifier (and static bonuses) aren't added to the damage, but dazed is a solid condition (on a miss you still daze for a turn), and the target takes damage for attacking if hit.

Inner Circle Initiate (HotF):  Protector only.  The AP feature is a weak damage bonus, but the 11th level feature gives an ally in or adjacent to your Nature's Growth zone THP equal to their surge value when you use the power.  The encounter power is a friendly area burst 2 that creates a zone as an effect; enemies that start or end their turn in the zone grant CA until the start of their next turn.  Vanilla, but easy CA won't go to waste, and you can affect a lot of enemies with it.  The utility is an out of combat daily.  At 16 enemies that end their turn adjacent to you while you're bloodied take autodamage.  That's a solid deterrant against melee attackers (and if nothing else it'll increase your DPR).  Might be worthwhile to carry a low level Blood Fury Weapon just for the power.  The Daily is a simple blaster power that creates a moveable zone which deals autodamage to creatures ending their turns in it. 

Keeper of the Hidden Flame (PHB2):  This is a good pick for Sentinels since their Animal Companion is an ally (which makes the 16th level feature, the utility power, and the daily power more useful).  A good default for Sentinels that don't need the healing of Spiral Wind's Ally.  The 11th level features are useful to any Druid: re-roll a missed attack when you AP and get +1 to attack against your nearest enemy with close, ranged, and area attacks.  If you have an ally that likes to charge, the 16th level ability is a nice mobility buff.  The 11th level encounter power offers excellent single target control: vs Will attack that pulls the target, knocks it prone, and dazes it for a turn.  The utility is an encounter power that buffs your party's attack and damage in a close burst 5.  The Daily is an odd power reminiscent of Call of the Beast, though it's single target.  Probably the weakest feature of this PP (assuming you have a charge-happy ally).  Overall, everything about this PP is fairly solid, though it lacks anything that really stands out as amazing.

Luminescent Swarm (PrP):  The stronger of the two Swarm Druid PPs.  You have an Aura 5 that grants allies a +2 bonus to saving throws (and sheds bright light), and you deal bonus radiant damage when you use an AP.  Starting at level 16, when you use Wild Shape to enter humanoid form, you can choose an adjacent enemy to get a -2 penalty to attacks against you.  The features might not be amazing, but they're all moderately useful.  The encounter power is a vs. Will blast that offers dazing, sliding, and lets you shift 1 square for each target you hit.  Awesome!  The utility is situational (a sustainable Daily that says "no more concealment for you!" in a close burst 2), but the Daily is gold:  enemies only close burst 3 that attacks all 3 defenses (one attack roll for each target); hitting Fort deals ongoing radiant damage, hitting Reflex lets you slide the target 5 squares, and hitting Will blinds the target (save ends).  Whoa!  The damage applies if you hit any defense.

Pack Lord (PrP):  This PP has solid features, including +1 to attack and all defenses when you have a summoned creature out, giving a minor action command to a summon as a free action when you AP (note that the summon can still use its instinctive action as long as this is the only command you give it), and at 16th level your bloodied summons gain regeneration.  The encounter power is a single target attack that lets you tell a summon to use a standard action attack; if you don't have a summon out it might even work on one of your allies intead!  The utility is pretty much a carbon copy of Animal Clan (10th level utility), but it allows you to use any standard action attack instead of just the instinctive action.  Note that once you hit epic, taking Primal Summoning Expertise makes this utility useless.  At 20th level, you can choose a 19th level Druid summoning power (the Guardian Briar and the Swamp Behemoth are the better choices).  If you plan on spending a lot of time in Epic (with Primal Summoning Expertise), this path becomes a better choice than Primal Summoner, as PS's 11th level feature works with Instinctive Actions, which your summons won't be using if you're giving them standard action commands as minor actions.

Shadow Dancer (HoS):  You're looking at improved mobility via teleportation and gaining CA for doing it (not that you usually have trouble getting it, but it could save you a feat slot).  Your best teleport, Feywild Sojourn, doesn't work too well with it though, since you reappear the turn after you teleport (thus you won't get CA from the level 11 feature).  Still, it'll meet the pre-req for the PP.  A free teleport when you use an AP and free invisibility for being hidden (situational, as most Druids don't become hidden that often) round out this PP's features.  The encounter power is phenomenal, combining a self-teleport, a MBA, teleporting the target on a hit, and dazing all into one juicy package.  Works really well with either Grasping Claws or Savage Rend. The utility is also very nice, though I don't get why teleporting as a minor if you're adjacent helps you; you already used your minor to activate the power, so aren't you essentially just trading your move for a minor instead of just using your move directly?  Ah well, mobility is mobility.  The Daily is odd, creating an enemies only damaging, slowing, and obscured zone along the path where you shift your speed.  Use it to debuff enemy ranged attacks made through it and push/slide melee guys into it.  Overall a sub-par level 16 feature balanced out by an amazing encounter power makes for a decent PP, given that the other features/powers are solid (if nothing too spectacular).

Spiral Wind's Ally (PrP):  This is a good choice for Sentinel's (assuming they have a decent implement), but Wild Shape Druids will likely get annoyed with with level 11 features being restricted to humanoid form.  Sentinels have enough healing to get a lot of mileage from Healing Spiral, and allowing an ally to spend a healing surge whenever you use an AP is solid for any Druid build.  The 16th level feature lets you shift 2 squares as a free action when you spend a healing surge, which could be useful for re-positioning.  The encounter power is a decent enemies only blast with some surgeless healing for allies adjacent to the target(s).  The utility power is an encounter power, but it's dependent on your allies' use of second wind; with few exceptions (Dwarves being the most straightforward), PCs typically only use second winds as a very last resort.  The Daily is nice because it's enemies only, and because you get to choose one of three damage types, with each one causing a different effect (yay versatility!).  Unfortunately, the effects aren't amazing: either all targets slowed (weak for this level), all allies in blast get surge free healing (by far the strongest option), and one enemy in blast dazed (why can't you daze everyone?  It's a Daily!!!).

Formless Predator (D394):  At level 11 you get a small 1/enc damage boost and a cosmetic benefit, though the AP feature (shift + ending a condition) is solid.  At 16th level those pining for Natural Spell can be sated; you can give one of your at-wills the beast form keyword, which disappears when you change back to humanoid form.  The obvious candidate is Grasping Tide, as having a ranged AoE in beast form can be handy (if you're immobilized/restrained, or if you don't want to lose out on threatening with an OA).  The encounter power offers solid mobility and damage, but a single target daze is a bit of a let-down (you've probably been dazing 2 targets with Predator's Flurry, which also offers mobility, since level 3).  The Daily is solid as it guarantees blindness and deals respectable damage, but is still single target.  The utility is probably my favorite feature, since it lets you get around that 1/turn restriction on Wild Shape (the wording of which means that you're always under a polymorph effect, so you can use this in both beast and humanoid form).  The THP and safety net vs Petrification are just icing on the cake (the utility alone almost tempts me to bump the path up to blue).

Guardian of the Living Gate (PHB2):  The 11th level feature makes your AoE's more accurate (conditionally), you can grant a save with an AP, and at 16th level you grant a save when you fail one.  The utility also grants allies a save bonus against attacks from a certain enemy.  Overall, this PP has a strong leader slant to it.  The encounter power is a moderate self-buff, and the Daily offers single target damage with a little control.

Nocturnal (HoS):  This PP is primarily focused on damage and gaining phasing, which obviously increases your mobility.  The level 11 feature gives you phasing during the movement of your charges, which combined with a Badge of the Berserker means you can feel free to charge through enemy spaces.  When you spend an AP and hit w/ an at-will, you can charge as a free action.  The encounter power is very nice, as it stacks damage onto a melee attack and gives you THP.  The utility seems a little odd and underpowered for a Daily, but free flanking can certainly come in handy (still, I've never had problems getting CA as a Druid).  Unfortunately the level 16 feature is garbage (who trades their standard for a move action?), and the Daily is a bit underwhelming, though though at least functional.  Like Blood Moon Stalker this path increases your nova capacity, but it does so more by providing several ways to tack a little bit of damage onto attacks.  Overall I think BMS does the job better (and provides better survivability), but if you like the idea of phasing you might prefer this.

Primal Mapper (D382):  This PP is all about mobility, which is one of the Druid's strengths.  The 11th level features allow you to move your speed or shift half your speed when you AP or use your Second Wind (hint: Vital Form (P feat), Wild Surge (E feat), Dwarf, and some items and powers (see Shaman's Hearth Spirits) are great second wind enablers).  At 16, you ignore difficult terrain completely, which is pretty gravy for a mobile melee controller.  The encounter power gives you some meh soft control, but it also provides extra damage to an at-will attack, and Druids have great at-wills that they tend to use frequently.  Plus as far as I can tell the extra damage would apply to all targets of an AoE.  In my opinion, this is the best part of the PP as far as a Druid is concerned.  The Utility power is nice, especially since it makes the slow condition a whole lot more useful.  The Daily is pretty underwhelming from a controller's perspective, but if you're struggling with concealment it certainly has its uses.

Sky Hunter (PHB2):  Flight speed before an AP is nice, but an attack bonus against flying creatures is very situational, and Perception bonus after a beast form Daily (at 16th level) is underwhelming.  The utility is basically Black Harbinger.  The encounter power is an excellent single target attack though: fly twice your speed without provoking an OA from the target, and on a hit the target is blinded.  Blinding stuff is always gravy, but it's the mobility that really makes this power useful.  The Daily grants you a "single move fly speed" (you have to land after your move action) for the encounter while in beast form, and a single use attack that packs a nasty punch: enemies only close burst 5 that deals respectable damage and slows (save ends), or for a turn (on a miss).  Poor features + good attacks average out to an average overall PP.  Also, this would have been a perfect opportunity to give Druids at-will flight, so I'm a little bitter that the PP doesn't offer this.

Steadfast Sentinel (HotFK):  Only Sentinels can take this path.  The encounter power is yet another use of Combined Attack: no thank you!  A free shift that ignores difficult terrain for you or an ally when you make an AP is nice, and the other level 11 feature (you ignore difficult terrain) is nifty, but it's nothing really that mind blowing.  The utility is by far the highlight of this PP, giving you and 1 ally regen while bloodied, which can be ended as a minor action to spend a healing surge with some bonus HP.  The level 16 feature just seems out of place, as an at-will power that lets you polymorph into another humanoid.  Sentinels choose to give up shapeshifting, and this isn't as cool as Wild Shape.  The Daily would be nice if it were a minor action, but IMO spending a standard action to activate an aura without making an attack isn't all that great at this level.  Most Sentinels would do well to choose something else; Spiral Wind's Ally, Guardian of the Living Gate, or one of the Summoner PP's make great choices.

Vermin Lord (BoVD):  A niche PP that largely focuses on movement options and buffing/debuffing (and notably requires an Evil alignment).  The AP feature is a combination auto-damage/defensive buff for enemies/allies (respectively) adjacent to you, and the feature is vanilla poison resist (a common damage type at least).  The encounter power has several minor effects that combine into a pretty decent package (except for it being unfriendly), with vulnerability 5 all as an effect being the highlight.  The utility is pretty "meh," especially as a daily, though the level 16 feature provides a really easy way to gain a fly speed (it's not permanent, but lasts for a turn after you use an encounter or daily power, which should be most of the combat).  That feature is easily my favorite feature that this path offers.  The daily provides ongoing 20 poison damage as an Effect, which is pretty interesting (even if it's not particularly powerful).

Whirling Samara (PrP):  I love the flavor of the mixed swarm that this PP touts (a swirling mass of birds, insects, leaves, and seeds), but at the end of the day you can apply that flavor to any Swarm Druid right out of the box.  You gain immunity to ranged and melee forced movement attacks while in beast form (can we say situational?) and you get to make up to 2 attack re-rolls before the end of your next turn when you use an AP.  There's a catch though - exercising the re-roll option will deal damage to you.  The level 16 feature is a bit better, giving you a fly speed for a turn when you wild shape into beast form.  The encounter power has a hint of leader, as it grants THP to an ally within 2 squares of you when you hit (notice that you can attack 1 or 2 creatures, so you can give 2 allies THP).  Still, the THP is only equal to your Wis mod.  The encounter utility is excellent: when you wild shape into beast form you become insubstantial until the end of your next turn and you can move through enemy spaces.  Nice!  And finally, the last element granted to you by this PP is actually probably the best.  The Daily power is an enemies only blast 5 that blinds (save ends), in addition to dealing respectable damage.  The effect grants you some buffs while in beast form, including the ability to shift 2 squares as a minor action and blinding (save ends) anyone you score a critical hit against (the zone from Entangle provides some nice synergy here). 

Storm Speaker (PrP):  This PP wouldn't be that bad if you had more lightning and/or thunder powers.  Moreover, limiting yourself to the small number of the ones that you do have would probably result in a sub-par assortment of powers (you don't have many lighting/thunder powers that are particularly good).  Two of the features only come into play if you use lightning/thunder powers (so not often for most well-constructed builds), though the free action flight when you use an AP is nice (and having lightning/thunder resistance is likely to come up at some point during your career).  The encounter power is a bit bland, though it can be used to set up a better attack.  The utility isn't bad - a defensive buff for the rest of the encounter and the ability to slide enemies that end their turn adjacent to you.  The initial attack of the Daily is a flexible multitarget power (1, 2, or 3 enemies in a close burst 3), but at the end of the day this power is all about damage, without a control component.  Meh.