I know there is a better one for the mac, but I wanted a free one.
Use CamStudio, Fraps, or another screen capturing software to get footage of something you do on your computer. A few minutes of gameplay is a good example.
So I wanted to just show some of the things Lightroom can do briefly. I tried to stay with the things that were visually interesting and not the more technical aspects.
Excuse the ad in the on the video in the bottom left.