we have updated the AS3 API docs now based on good old asdoc documentation tool.
Actionscript 3 documentation
A little background history:
We tried to use another doc tool for a while called VisDoc which had some cool features but sadly it turned into a nightmare!
I wouldn't put out this in the public if it wasn't for a good reason... the reason being that we would like to avoid useless pain in the butt to anyone thinking of using the above mentioned documentation tool. In two words: avoid it, you will never regret it.