Its a mouse, you use with your foot, freeing up both hands for typing.
You may laugh now, but this device is already well on its way to becoming the new paradigm in human-computer interfaces… or something like that. I encorage you to make your own, they are great fun, and actualy useful if you use an optical mouse. Please link to any pictures of your versions! Possible improvements include mounting auxilery USB ports on the side, or embedding a flash drive.