IDE Asteroids

For a taste of some of the crazy stuff you can do with the new extensibility layer in Flash MX 2004, check out IDE Asteroids. You’ll need Flash MX 2004 and the latest version of the Extension Manager available on Macromedia’s site.
The game installs as a Window SWF and lets you play the game right in the authoring environment. Obviously not the most practival example of using extensibility, but a pretty powerful example of just how much you can do with it.