I finally made it to a meeting of the Atlanta Flash and Flex User Group. Ryan Swanson gave a great presentation on the Flex Data Services Framework, which was quite interesting. He also also showed us his project Regular Expression Explorer. Written in Flex, it looks like a really slick application.
Below are a few mostly Flex related links that might be of interest:
Not Flex specific, but if you need to satisfy your Mashup needs: http://www.programmableweb.com/
Several interesting Flex blogs:
A ton of presentations: