FlashKit.com
AS2 to AS3
Advert Best Practices
ActionScript 3 Design Patterns
Kirupa.com
ActionScript.org
Flashguru.co.uk
Scripts20.com
Object-oriented-ActionScript
Flash Tutorial
Misc. Flash/PHP scripts
Wikipedia AS

Flash Samples

Flex/Ajax Bridge
Flex 2 Component Explorer
Flex and AS3 Tools, Libraries and Components