Note: Flex 4 shipped on March 22, 2010.
The final version of the usage content is available at http://help.adobe.com/en_US/flex/using/index.html.
The Platform Reference is available at hthttp://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/index.html.
I want to tell you about Blueprint, which we released on Adobe Labs last week and just last night updated to include support for Mac, Windows, Flex Builder 3, and Flash Builder 4.
Blueprint is an innovative code-centric search application, initially delivered as an Eclipse plug-in. It is a custom search tool that searches only for code (for now, it searches just for MXML and ActionScript). So, for example, if you search for DataGrid, it returns a set of code examples that use the Flex DataGrid control. But what’s really cool is that you can easily highlight, copy, and paste chunks of code right into your application, all without leaving Flex/Flash Builder.
For more information, see the Blueprint page on Adobe Labs