I wonder though whether users really want lots of fancy animations. Our apps have way too many that add absolutely nothing to the usability, and in fact take away from it as you have to wait until things are done sliding around the screen. It's not that some animation is a bad thing, but give people such easy ways to make everything move and dance and you wind up with a modern version of 1990's websites. Of course it's just a tool in the end, but knowing our design teams, we will get 5X more bouncy and 1/5 the usefulness.