Marramgrass

Further than you think.

From here:

Face it, you know you work on your computer too much - but how much? Mouse Odometer is a mouse tracking program. It tells you how far your mouse goes, how many keys you've pressed, and how many mouse clicks you've had for every application you use. Mouse Odometer has tons of other special features, and best of all - it's FREE.

File under: geeky, but fun!