Sources

http://www.macromedia.com/devnet/mx/flash/ (Flash Developer Center)
http://www.actionscript.org/tutorials.shtml (Flash Tutorials)
http://www.flashkit.com/ (Flash Kit)
http://www.w3schools.com/flash/ (Flash Tutorial)
http://www.kirupa.com/
http://www.openswf.org/ (Flash File Format Information)