There is already a formatter built into eclipse, but I haven't had time to figure out how to make it work, as it's disabled the CTRL-ALT-F auto format eclipse feature, but what does work is copy and paste the code from the *.as & *.mxml files and paste into a *.java or *.xml file, then do the CTRL-ALT-F formatting, then paste back into the original files. Pain in the butt but works fine.
I haven't tried pretty or jalopy either, but maybe those will work.
