I was at the local bookstore the other day and spent most of the time flipping through Elemental Magic: The Art of Special Effects Animation. by Joseph Gilland. It had some amazing stuff in it for 2D animators.
I also found his blog. Halfway down the page he has some videos and explanations about some animation effects done at Disney.
Even if you can buy or flip through the book, his blog is very good. Does anyone have this book yet?