Reference
ActionScript 3.0 Reference
Using Flash Builder 4
Using Flex 4
Accessing Data with Flex
Flex Developer Center
Flex 4 beta in a Week
Tour de Flex
Tutorials
Flash Builder 4 on Adobe Labs
Flex Forums
Flex Support
Changing the Help command/F1 default page
To change the Help command destination for all your Adobe CS4 products, choose an option:
Community Help (all adobe.com Help and support plus selected community expert content) Help on the Web (product Help system only)