Tweensy is currently a closed beta Flash tweening engine that is meant more for bitmap and particle rendering. So far it has a very impressive demo library and the API doesn’t look half-bad although it’s a little cryptic without proper ASDocs (hint hint). I like that the author decided not to market himself as a replacement for already strong tweening packages like TweenMax but rather as a tool to use for for unique situations like particle FX.

Examples:

Link: http://www.lostinactionscript.com/blog/index.php/2008/08/31/as3-tween-engine-tweensy-preview/

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