There's been a lot of talk about Flex versus Flash and the ability to integrate Flash content into your Flex applications. To be honest its always been a bit of a pain to get that all working seamlessly until I saw the Flex Component Kit for Flash CS3 demo'd just now. Its basically an extension that lets you package up a Flash movie clip as an SWC for use in Flex, complete with code-hinting, states, transitions, custom events etc. You won't believe it until you see it -- the improvement in workflow is just tremendous, its now easy to get that creative look from Flash over to Flex and you'll save hours implementing it.
Be sure to check out labs.adobe.com early next week!