I'm guessing that most developers have, at some point in time, had at least one O'Reilly book on their desk. And its probably right by your computer, serving as one of your primary references to help you build great applications. I know many developers swear by O'Reilly titles as the best in business.
You may have seen some of the early work of a relatively new partnership between O'Reilly and Adobe, but you may not have realized how many great books are out there.
Now, you can check out the Adobe Developer Library Store on O'Reilly.com to see whats available. I've also listed some of the titles below.
ActionScript 3.0 Programming: Overview, Getting Started, & Examples of New Concepts
Intro to Flex 2
Programming Flex 2.0
Flex Early Evaluator Guide by Effective UI
And coming soon...