Check it out! Flex 3 is now out in public beta. Go download it! now! :) Flex 3 has some pretty awesome improvements that it's seriously worth checking out.
Download the new Flexbuilder 3 moxie app here. http://labs.adobe.com/technologies/flex/flexbuilder3/
and here's a good overview of what's new with flex builder 3:
A couple of the neatest things that i'm excited about are the webservice introspection and the code refactoring. The web service introspection is huge. this allows you to point at a webservice, and then flexbuilder goes and creates a whole set of objects for you to use allowing you to keep strong typing over webservices. The best part is that it seamlessly transfers values over to the internal classes.