Adobe released yesterday the public betas for Flash Builder 4 and Flash Catalyst. Flash Builder 4 is the new version of Flex Builder which got renamed as Flash Builder recently, it is the tool to use to create rich internet applications using MXML and ActionScript.

Flash Catalyst on the hand is a new tool aimed at designers to allow them to transform Photoshop and Illustrator file documents into rich internet applications using a number of actions and user interface elements.

You can download both betas from Adobe Labs. You can get a quick start with these tools by checking the introductory tutorials for Flash Builder 4 from Adobe and the new video tutorials on both Catalyst and Builder from gotoAndLearn.