ActionScript Tutorials

Macromedia - Developer Center : Flash ActionScript 2.0 Learning Guide
This learning guide introduces ActionScript in Flash and provides you with tools for developing your skills. A very nice ActionScript 2.0 Learning Guide that covers topics like data types, event handling, syntax and OOP in ActionScript. Very useful ActionScript guide for all levels.
Source:http://www.adobe.com/devnet/flash/

ActionScript 3.0 Language Reference
ActionScript 3.0 language reference from Macromedia for the serious programmers. A very useful resource for an ActionScript developer.
Source:http://www.macromedia.com/go/AS3LR

ActionScript tutorials from actionscript.org
ActionScript.org hosts a number of quality actionscript tutorials, covering every nut and bolt of actionscript. A must visit for every actionscript learner.
Source:http://www.actionscripts.org/tutorials.shtml

Learn Actionscript - AHFX
Very nice ActionScript tutorials--from beginner to advance level. Some practical examples are also a part of these tutorials.
Source:http://www.ahfx.com/

OOP in ActionScript 2.0
This tutorial discusses some of the OOP concepts of ActionScript 2.0. A very nice detailed disucssion of OOP in ActionScript 2.0.
Source:http://www.ultrashock.com/tutorials/flashmx2004/as2-01.php

Interactive Spot-Light Effect (Masking) Using ActionScript
This tutorial is a step by step guide to building an interactive spot-light effect using ActionScript. This tutorial teaches by example.
Source:http://www.oman3d.com/tutorials/flash/mask_as_bc/