Note: You no longer need this application. Whilst Apple Quicktime X removed loads of useful features it did add the ability to capture videos of your desktop. This is provided here in case your on an older version of OSX
Do you want to record your desktop as a video?
Perhaps your making an instructional video, or simply want to record what your doing. If so DesktopRecorder is the tool for you
As this records at full screen resolution you may want to use a tool like iMovie to post processes it into a more manageble size.