How many (OS X) Flex developers out there?

I'm getting into Flex development now and I'm looking for some good sources (e.g. blogs, tutorials, etc.) to learn about the technologies used in developing Flex applications.

I just bought a MBP, so what sort of things should I install in order to help with Flex development on my machine? MAMP? Flex Builder? Should I buy it or use the Eclipse plugin and the SDK to start? I've got the Flex Cookbook and Training From the Source books. I learn best by doing, so very involved tutorials work very well for me.

I really love the idea of creating RIAs. I've been a Java developer for a few years and I'm getting tired of the same old enterprise applications...

I'm looking to use technologies such as PHP, AJAX, XHTML, CSS3--you know, the usual. Eventually, I'd like to learn about the BlazeDS framework (since I'm a Java developer).

Any tips from anyone currently developing Flex apps on their Mac? Thanks.