Tweensy, developed by the notorious “Lost in Actionscript” blog owner Shane McCartney. I am personally a fan of Greensock’s Tweenlite package, and there aren’t any AS3 projects I haven’t used it, but I must say Tweeny is the first one that actually woke my attention. It seems slick, fast, (very fast), and best of all are the effect packages it can be extended with. I also tried out the abilities to tween along complicated motion guides, and must say, I was really waiting for that one!
I will keep a few of my experiments with it posted here, but hey, flash community, there is movement!!

http://www.lostinactionscript.com/blog/index.php/2009/01/05/tweensy-goes-public/