UPDATE (3/4/09): Twease 2.0 is now available, now with AS3!
Twease is a lightweight, yet powerful, extendable universal tweening engine and sequencer for AS2 and AS3. It’s free and open source, under the MIT license.
It offers some unique features not found in many engines, such as tweening by rate,
multi-point bezier tweens, stackable properties, and a full-fledged sequencer, all in around 3k.
More information:
Twease Blog: http://blog.visualcondition.com/
Homepage: http://play.visualcondition.com/twease/
Download - Google Code: http://code.google.com/p/twease/
:mountie: Enjoy!