Not sure if it REALLY counts as a Disney short since it was made before Tim Burton hooked up with Disney for the Nightmare Before Christmas (I think), but
Vincent is my favorite short EVER, and not just out of the Disney category.
You guys seriously need to watch this:
http://www.youtube.com/watch?v=6_YI_GHwfRg
Beautifully read by the late Vincent Price.
It was included on the Nightmare Before Christmas special edition DVD, so IDK... maybe Disney had SOME rights to it?