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PixLib is an AS2 framework developed by Francis Boure. It contains many useful classes which help to keep your project well organized + keep the application logic and the design part separate.

PixLib has maybe a steeper learning curve, but it is definitely worth to spend 1 or 2 hours learning it.

My favourite classes from the library are the ConfigLoader, which makes loading of the xml easy. Very powerful is the XMLtoObject class which enables to define you the node types (string, number or even your own class).
For loading assets, the GraphicLib is invaluable.

PixLib implements MVCC (Model-View-Controller + Command) pattern which helps you structure your apps and keep the design and logic part separate. A very good tutorial which guides you through this pattern and the PixLib framework can be found here: http://dev.webbymx.net/?p=24

If you are an ActionScript programmer giving PixLib a try is a must. I self was using some own classes and patterns before, but the PixLib's are far more superior.