A hotfix and an update, both worth mentioning, came out last week while at WebDU.
Adobe released Flex 2.0.1 SDK hotfix 1 to address a number of bugs, full details in the link below.
Version 4 of Charles came out as well, this is an essential tool for RIA developers that allows you to view the traffic between your machine and the internet.
Flex 2.0.1 SDK Hotfix 1: http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=kb401224
Charles Web Debugging Proxy: http://www.xk72.com/charles/