Greensock has released TweenMax. Looks really sweet – I don’t do many bezier tweens, but having the ability to do that, filter and color tweens in one class is appealing. I’m going to try to integrate it in to Ramen so that I can use it for my rebooted Nudoru site.
Draw Logic has a good list of the availble animation packages. Matt Przybylski comments and links to an article on his blog on getting started with animation packages.