I'm surprised not to see Fantastic Mr Fox nominated so far, unless I've skipped over it. I think it's fun and heartwarming in equal measure and visually beautiful too. It's one I really thought would enjoy univers acclaim.

Fantastic Mr Fox

Waltz With Bashir

Shrek

Pretty close and interchangeable with one another are Shrek 2, Monsters Inc. and Uni, Mulan and The Princess and the Frog.