I just noticed on the Adobe Flash Builder Labs page that Flash Builder 4 beta 2 is available for download; http://www.adobe.com/cfusion/entitlement/index.cfm?e=labs_flashbuilder4 (Release Notes)
Also, head on over to the Adobe Flex Developer Center and check out the following articles:
- What’s new in Flash Builder 4 beta (updated for beta 2)
- What’s new in Flex 4 beta (updated for beta 2)
- Five great new features in Flash Builder 4 beta
Got questions? Visit the Labs forum for Flash Builder 4. Found a bug (or have an enhancement request)? Visit the Flex Bug base. Also, don’t forget about the Adobe Flex Cookbook (which has a growing number of Flex 4 beta posts). And finally, please go check out the excellent Flex 4 Beta 2 documentation; Flex 4 Beta 2 documentation live.