Natural Spell
I said I wouldn't be a sheep last round, so I'm voting for Natural Spell. It's really a no-brainer, being able to cast spells while shapechanged is simply too good of a benefit for a Druid not to take it. Because of this, I feel that Natural Spell should be voted off... it really should be a class feature, or maybe even a prestige class feature. Certainly it shouldn't be a general feat that most Druids would be remiss in not taking by sixth level.
Not only that, but the image of a deer gyrating its head and snorting to cast an Ice Storm really bothers me.
Oh, my pick to win is Whirlwind Attack. Just because.