I saw WALL-E last night.
This movie has a different feel than previous Pixar films. The main characters don't talk, so communication via expression is the focus...and it works.
Ben Burtt (responsible for R2-D2's chirps, light saber sounds, Darth Vader's breathing, among others) did the sounds of the robots in WALL-E. The sound is one of the reasons I really liked the film.
Sigourney Weaver gets a chance to see other side...she is the voice of the ship's computer and gets to do the "this ship will self destruct in 5 minutes" line.