I just have to mention how satisfied I am with the tween class that I have been using for the passed few months. For those who don't know, a tweening class is a custom set of ActionScript classes that allow you to animate any type of property in your application with pure code, no keyframes on the timeline. Jack Doyle of GreenSock has some great classes that does just that. It is the smallest filesize and most efficient tweening class I've worked with so far. Jack is constantly improving these classes. This week he just updated the sequencing capabilities with the TweenGroup class.
Below was created with a simple TweenGroup that is set to loop.
Here is a list of all the features for the classes.
http://blog.greensock.com/tweening-family-comparison

October 21st, 2008 at 8:09 pm
I use HydroTween with Go myself. Much better performance, and saves having to do all of those delay calls in sequencing.
http://www.goasap.org/benchmarks.html
http://code.google.com/p/goplayground/wiki/HydroTween
October 21st, 2008 at 10:35 pm
Using TweenGroup, it does perform the same type of sequencing without the need for delays. Go does look slightly more efficient in performance, but I’m satisfied with the ease of use and support with TweenLite.
I haven’t yet come to any crossroads where I found myself needing more out of a Tweening class.
October 23rd, 2008 at 5:12 am
Feel free to present Go at a future CPFUG meeting if you’d like. I will probably present TweenLite at some point.
April 4th, 2009 at 4:37 am
I know this is an old post, but for what it’s worth, I’m pretty sure HydroTween doesn’t outperform TweenLite/Max. Quite the opposite actually. http://blog.greensock.com/tweening-speed-test/ And as far as sequencing goes, TimelineLite and TimelineMax make it extremely intuitive (they’re the sequencing tools for TweenLite/Max which replace TweenGroup). http://blog.greensock.com/v11beta/