Wallace and Gromit was awesome.
Ever since Chicken Run came out, that claymation style has been unique...and it worked well--especially showing Gromit's expression since he can't talk. It's all in the eyes.
Perhaps I'll never think about rabbits the same way again.
Beyond that, the adult humor was obvious, coming from Katz and co. Good thing the kids didn't pick up on that.
Chicken Little on the other hand, I'm not sure I'm going to want to see. There was a preview for that film as well before W&G (naturally) and I think its based on really weak one liners. Usually previews don't tell the whole story, so maybe I'll be surprised.