ActionScript 3:Learning Tips
http://labs.macromedia.com/wiki/index.php/ActionScript_3:Learning_Tips
ActionScript 3.0 Language Reference
http://www.macromedia.com/go/AS3LR
Programming ActionScript 3.0 book
http://www.macromedia.com/go/programmingAS3
ActionScript 3.0 - Wiki
http://labs.macromedia.com/wiki/index.php/ActionScript_3