Animating frames is done in very few addons, however all of them that have done it are very well known (SCT, Sprocket, SlectionRing). To make an addon that would essentially animate any frame would be crazy cool.
Theirs also another thread discussing this idea, but it's an old thread, and much more broad in the description: http://www.wowace.com/forums/index.php?topic=1952.0
Excellent idea, I'd like to see something like this.
CT_Core has a cool sliding options frame, as does Natur EnemyCastBars