Flash Tutorials

Some cool Flash programs (most are open source, all are worth checking out)
• Visualizer
• Box2D; An open source physics engine with many classes you can use to simulate any kind of world you can imagine!
• onyx : Daniel Hai's creation

Movie Clips
• How to create a motion tween (step by step tutorial with pictures)
• How to duplicate a movie clip and use a loop to create a pattern
Text Fields
• How to use author tools to create a text field, embed characters the use actionscript to adjust the text field
Arrays
• How to declare & initialize an array

Useful Resources
• Senocular.com Excellent resource. Senocular has an expert knowledge of the ins and outs of Actionscript and contribues on almost every major Flash forum. In fact, he was the only person who answered a question I once posed on Actionscript.org.