Are there any lint tools available for actionscript? One source would be ideal, but anything is welcome.
My team is starting to adopt more a more rigorous style gui
I have used jslint in the past for jscript. As is written in JavaScript and the full source code is available, so you should be able to get it working with actionscript. I have not used any of the other tools mentions in the answers, so I don't know how they compare.
(jslint takes a very strong view about what is good jscript, you may or may not agree with it.)