A lot of my family is based in New Orlenas, so The Princess and the Frog really hit home! Who could forget Finding Nemo as well! I'd have to agree with all of the ones said so far.
In terms of strictly Disney, it's gotta be The Hunchback of Notre Dame. Great music, great story, and Frollo himself is an amazing villain. My favorite film under the Disney label is WALL-E.