Mouse Tracker.

 

via Anatoly Zenkov

Anatoly seems to have created this program that maps the mouse activity on you computer.  My map is for about 1/2 hour.  The lines represent movement of the mouse and the dots represents inactivity with large dots showing longer pauses.  I primarily use AutoCAD, so you can see that my image has a lot of horizontal and vertical lines given the nature of my work.  Longer periods using the program can look really terrific with a lot of density of the lines.

You can download the program here.

What does yours look like?