CraziestGadgets.com

I’m not sure why they’re calling this the “mice” wheel when there’s just one mouse, but I supposed it’s to avoid confusion with that other desktop peripheral called a mouse. Naming conventions aside, the USB Mice Wheel is a tiny little mouse on a wheel that runs as you type. The more and faster you type, the more and faster little Stewart the mouse runs (yes I named him). A great touch-typing training tool or productivity monitor for bosses… “I don’t see that mouse running Johnson, get typing!”.

product page via red ferret