How can I get started with ActionScript?

I would like to learn a bit about using ActionScript. I currently know zero about Flash and such, so I kind of want to learn a bit, so I am not so lost when it comes to this subject. Are there some really simple tutorials on how to get started?

Please include:

• Development environment needed (IDE, and such)

Something as simple as a Hello, World! would be fine. At this moment, I don't even know the difference between ActionScript and Flash.

1. Get yourself a copy of FlashDevelop
2. Create a new project
3. Select from the dialog "AS3 Project"
4. Open the Main.as file
5. Save the below

6. Hit F5 to Test Movie, your first Hello World

   package {
       import flash.display.Sprite;
       import flash.events.Event;
       import flash.text.TextField;
   
       public class Main extends Sprite 
       {
           public function Main():void 
           {
               if (stage) init();
               else addEventListener(Event.ADDED_TO_STAGE, init);
           }
           private function init(e:Event = null):void 
           {
               removeEventListener(Event.ADDED_TO_STAGE, init);
               var txt:TextField = new TextField();
               txt.text = "Hello World";
               addChild(txt);
           }
       }
    }