Need a good source for beginning AS

Hey everyone,

Im looking for a good source of information on Actionscript and how to use it. It can be a book website any and everything. Ive used flash for a few months now but i want to improve my back end coding in flash but i have no idea where to start. I was hoping you experts could fill me in on a good place to learn at least some of the basic principles of AS writing and use.

Oh and just to clarify i have reviewed the sticky on this topic. I was hoping to find something more in the way of a book but websites links would still be appreciated.

Thanks for your help.