Hi,
I forgot to mention a great feature of Fragmotion:
you can create sprite flipbooks automatically from animated characters!
here you can see the simple menu and an end result of my first tests:




the sprite arrangement is customizable, you can create it with or without shadows, position and size data are saved in an xml file.
unfortunately the alpha is saved wrongly, it requires some further works with photoshop/gimp...

Edit: the latter issue is GPU and driver dependent; in my case it was bad with Intel, but fine with ATI; and said to be wrong with some NVidia cards/drivers...