Here is a really great article by Senocular about the different versions of the Flash Player, authoring tool, ActionScript, Flex, SDK, compiler, etc. The whole thing has gotten so complex that we really need something like this to keep track.
http://www.senocular.com/flash/tutorials/versions/
Sometimes I forget the details of whether my Model should know about my Controller and that sort of thing. I found this little MVC cheat sheet on the internet that got me straightened out in a jiffy with step-by-step instructions. The page is actually the lecture notes from one of Colin Moock‘s presentations circa the Essential AS 2.0 days but it’s still very useful. Those of you struggling with the lingo, replace Observer with EventDispatcher and ignore the junk about attachMovie. God, how did we ever write AS2!?