I recently found some very impressive demos of a new excellent framework: Tweensy, by an English flash developer named Shane McCartney.

Tweensy is mainly 2 things: a tween manager (such as tweener or tweenlite) and a gfx generator which includes a particle emitter, a bitmap render system.
Till now I’m getting that kind of effects by combining tweener with a custom particle emitter or flint library, I’m very curious to try out this new promising framework