ActionScript.com launched their ActionScript Reference library this week. Complete with user contributed notes. Its a joint venture between several Flash resource sites, and many of the top ActionScripers in the community.
Building a reference for ActionScript has been something that the community has talked about for many years, and Macromedia has failed to deliver the reference resource so many developers and designers have been wanting for.
True, Macromedia have their ActionScript Dictionary, but that reference is both unsearchable and un-noted. Not allowing for user feedback to the dictionary is a strange move from a company that in all other aspects seems connected to the Flash developer community.
My best guess: If ActionScript.com manages to pull together the community to make a good resource, expect to see it picked up by MM at some point. OR, MM might just realize how lacking their own dictionary is today, and make a better resource for the developers.