Polar Express, The (2004)
I haven't seen the film yet, but I am curious why all the critics seem to think that this "technology" of using live actors against blue screens and animating them using a computer is groundbreaking. Ralph Bakshi did that years ago when he made Lord of the Rings. More recently, Richard Linklater did the same thing in Waking Life. They didn't use computers; they animated the actors by hand, frame by frame, coloring over them in each scene and adding background, etc. A more painstaking process but probably a lot cheaper.