Actionscript 3:
- see AS3 tips.

For newbies:
- Some facts about FlashDevelop Projects,
- Events scoping problem in AS2 classes,
- Problem with prototypes, hints: extending built-in classes (ie. MovieClip),
- Linking a library asset and a class.

Usefull threads to start working with FlashDevelop:
- Project samples & tutorials,
- The different workflows in FlashDevelop (alternative Natural Entry Point Method),
- How to use components created in the Flash IDE,
- Creating a custom preloader,
- How to use Shared libraries (Related technical discussion),
- Creating a class instance based on MovieClip without a symbol in the library.

http://www.flashmagazine.com/1243.htm

Review: FlashDevelop 2.0
by Jens C. Brynildsen

You may have heard of Open Source alternatives to Adobe Flash and thought "maybe I should try this". Believe me - you should. FlashDevelop is the best Open Source editor I've seen. It really has it all - it's developed by the Flash community, it's fast, it's free and it will even make you a better coder.