Check out the ActionScript Framework Downloader to download misc AS3 libraries straight to the current project. A great plug-in to help speed up development.
I just saw this link to the FlexFormatter come across my friend Tom Cornilliac’s Twitter stream and I was very happy. One of my biggest issues with Flex has been a lack of any automatic formatting. I’m really glad that Ernest Pasour decided to run with this. To install just drop the jar file in you Eclipse plugins folder, configure your preferences, and your good to go.