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Technical and philosophical arguments aside, knowing AS3 will make you more employable. If you scan the current job opportunities on respectable job sites (sadly, the Adobe jobs forum has gone to seed), you'll see the BIG demand is for AS3 developers, usually coupled with some knowledge of Flex. I'm in the process of making the (painful) transition to AS3 myself, just to finish getting my kids through college.
For AS3 I'd suggest:
ActionScript 3.0 Game Programming University (QUE) by Gary Rosenzweig. I find Rosenzweig's books to be a great start. He doesn't go into massive depth, but presents a bunch of projects that you can get up and running quickly; learning in bite-sized pieces.
Learning ActionScript 3.0 (O'Reilly) by Shupe and Rosser. Very good, even though the writing style is sometimes comically erudite.
Essential ActionScript 3.0 (O'Reilly) by Colin Moock. I like Moock's instruction, though he tends to get sidetracked in a lot in minutiae. The whole book's devoted to creating a single project... that you sometimes feel will never end.
As for Flex, I've picked up a copy of Adobe FLEX 3 - Training from the Source (Adobe Press), but haven't had the opportunity to take a crack at it.