For real, Flash Professional 9 is out in public alpha !
Meaning we can begin to familiarize with Actionscript 3 within the new IDE.
Download page here
Here are some interessing link
ActionScript 3.0 Language Reference
ActionScript 3.0 overview
Tips for learning ActionScript 3.0
Building an image-viewing widget with ActionScript 3.0
Exploring the Flash Professional 9 ActionScript 3.0 Preview
Programming ActionScript 3.0
ActionScript Technology Center
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Beware ! They fail to mention that their “Windows download” is in fact XP only ! So, if your company still has W2K desktops like mine, you’re lost for AS3… 🙁