BETA ActionScript 3.0 Reference for the Adobe Flash Platform released on help.adobe.com
I just "tweeted" this, but thought it warranted a nice little blog post as well.
The documentation team released a cool new version of the Adobe Flash Platform Language Reference (which includes all APIs from the following products: Adobe Flash CS4 Professional, Adobe AIR, LiveCycle Data Services, Adobe ColdFusion, Adobe Flex, and Adobe Flash Player -- as well as the Text Layout Framework (TLF) classes). And the great news is, you can filter content based on Runtimes (Adobe AIR and/or Flash Player) as well as by Product (Flex, Flash Authoring, LiveCycle, and/or ColdFusion).
http://help.adobe.com/en_US/FlashPlatform/beta/reference/actionscript/3/
For more information, check out the following blog posts by real live members of the Adobe Learning Resources team:
"Introducing the ActionScript 3.0 Reference for the Adobe Flash Platform " via Adobe Flash Platform Runtime Documentation Team blog
"One ActionScript Language Reference to rule them all" via FlashLit blog (Rob Dixon)