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