Doug Winnie, Group Product Manager for Workflow at Adobe, has a great video series on learning ActionScript 3.0. These free videos are really done well.

From Doug himself:

"Welcome to ActionScript 1:1. This integrated training resource combines video tutorials, documentation and sample files to teach you the basics of ActionScript 3.0 using Flash Professional CS4. ActionScript 1:1 is designed for Flash animators and designers that want to take their work to the next level and add custom interactivity using ActionScript 3.0, but need some guidance. In the series, I start with the very basics of accessing your objects on the stage and the library and then introduce ActionScript that will make your designs and animations interactive and dynamic."

Check them out.
http://www.adobe.dougwinnie.com/actionscript-11

These videos are also available in the iTunes Store.