Adobe released public Betas for Catalyst and Flash Builder 4 (aka Flex), and there's a brand new tutorial that will give you a taste of what's possible with them at gotoandlearn.
Basically, Catalyst makes it easy to turn a picture of something that looks like it could be an application into a fully working application, with minimal programming. It's very powerful.
Flash Builder 4 Beta: http://www.adobe.com/cfusion/entitlemen ... shbuilder4
Catalyst Beta: http://www.adobe.com/cfusion/entitlemen ... shcatalyst
Video tutorial on: http://www.gotoandlearn.com (grab the Illustrator file from the files link associated with the tutorial video)
Can also find some good stuff on Adobe Developer Connection.