A nice overview of ActionScript 3.0 over at Senocular
“With Flash CS3 comes support for ActionScript 3.0 - the newest, standards-based programming language for Adobe Flash (SWF) movies and applications. More so than in the past, you may find it difficult to get started with ActionScript 3.0 when compared to older versions of ActionScript. The transition to ActionScript 2 from ActionScript 1, for example, can probably be seen as a cakewalk compared to the leap to ActionScript 3.0, especially for someone who is prone to working and coding in the Flash IDE (Integrated Development Environment).
The goal of this article is to help acclimate you to working with ActionScript 3.0. It will focus on using ActionScript 3.0 within the Flash CS3 IDE, the first version of the Flash authoring environment to support this new version of ActionScript.”
http://www.senocular.com/flash/tutorials/as3withflashcs3/?page=1
