Here is another funky app to add some interest to your work day. Anatoliy Zenkov has developed a tool (Mac and PC) to track your mouse pointer during the day. Simply open it up and let it run in the background for as long as you like. 8 hours of mouse tracks from my day today look like this:
The big dots are times when the mouse did not move - for example, the bottom right dot is my lunch break. I've added some extra notes to the image on flickr to explain these dots. My movements around the taskbar are clear, as are mouse movements to the top left - I was using Excel for most of the day, and many of the functions I used were located there, as were the open / close file options. I found this tool on FlowingData. I'd be interested to see your tracks.