Apture's a slick Firefox extension that helps you to add and integrate all kinds of media into your blog. Andy and I are working on another video to show you just how cool you can get with it, but give it a whirl. It'll add a button on your compose window to help you along. (It works with Movable Type too.)
Thanks to all the awesome developers out there who keep building cool tools to use on your blog. Have a favorite widget or browser plugin you want to share?