NOTE: One place you will not yet find the 2.0.1 docs is ... livedocs.macromedia.com! But hopefully LiveDocs will be getting the updated docs soon ;-)
I guess it is ... but the link is not published ... tried changing 2 to 201 and it worked ... maybe it is not ready for release .... but anyways ... http://livedocs.macromedia.com/flex/201/langref/index.html