New to ActionScript (or Flex in general) and don't know how to learn the basics? Need a quick crash course? Then I have the hyperlink for you! Adobe has put together some small articles about the basics of ActionScript 3, such as language syntax, how to declare variables, namespaces and much more. The first article which talks about ActionScript Syntax is here and once you are done with that one, at the bottom of the page are the links to the subsequent articles.
So go get started if you are new to ActionScript/Flex/AIR, or share it with a friend/colleague who is looking to get started in this domain.