Just a quick note about two great articles which were recently published:
ActionScript Collections and Functional Programming by Bruce Eckel
In this article Bruce provides examples and insights into the functional pieces of ActionScript. He also covers some of the lesser known things about Collections. I learned quite a bit from this one!
InfoQ Case Study: NASDAQ Market Replay
Jon Rose worked with NASDAQ to create a great case study about using Adobe AIR, Flex, and Amazon S3.