I came across this video today via /Film, The Beauty of Pixar. Thought it was brilliant.
Leandro Copperfield spent eleven days rewatching the Pixar films and then editing together more than 500 scenes for this video.
Update 12.29.2010: Apparently the video was pulled. Bummer.
Update 1.1.11: It’s on YouTube now, but who knows for how long.