There are some tutorial I’ve googled, please look into it.
Game Interface-
AS-depth Sorting -
- http://www.flare-rpg.org/index.php/as3-depth-sorting-made-easy/
- http://blog.thoughtomatic.co.uk/?p=159
Sprite Animation-
Preloader-
Cool classes and prototype 
- http://proto.layer51.com/default.aspx (added since 14-12-2009)
Do check out mystic Circle as well.
Cia You..