Flash is a popular development tool for now a day webdesign and become the standard tools on web development.
As you are a webdesigner, you should learn it or you already learn it. But, since the introduce o f Actionscript 3.0, some people may stuck with the new programming language because it is well structured and more strict. You need more effort to start learning and master it.
But ActionScript 3.0 is a must for many jobs now. So, i Introduce some resource which help you to get start with Action Script 3.0.
Ntt.cc – Beginning Action Script 3.0
Flash Speaks ActionScript
Mike Chambers – ActionScript 3 Reference for iPhone
I will contiune to update this post for more resources.