Spriter is very promising, but still is a bit far of being totally usable!
There is something similar already available for ZenGL : CoolSprite Editor, and it is already very usable. With some small improvements it would be the definitive tool for doing these kind of animations! The original post is in Russian, but Google Translator can help! =)
http://translate.google.com/translat...c%2C297.0.html
Here is something I'm doing using it (for my next super secret project) .
Here a small video showing how to use the editor!
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