I am just loving the Tweening platform v11 by Jack Doyle. You keep on exploring the engine, it will keep on surprising you with its control, ease of use and flexibility. I used to be a big fan of Tweener before, but now its all TweenMax in my projects for the last 6-7 months or so. There a loads of features I can talk about right now which I absolutely love but may be I would explain them sometime later.
For now, I just want to say that I have now become a Shockingly Green Club GreenSock member and I would certainly encourage other developers to donate for all the effort Jack has been putting into making this platform so wonderful.