Here are a couple of quick videos I made this morning demonstrating some things that I think are cool in Unity.
EDIT: Please note that Unity actually goes much faster than it appears to in these videos. There are certain points where the video didn't really seem to keep up with Unity for some reason.
This demo shows using categories in the dash, and also being able to use the dash to quickly open apps without using the mouse.
This demo shows using the meta-key to use the launcher to switch to apps and launch apps. It also shows a little trick that you can use to put any command you want onto the launcher.