ThinkGeek :: USB Wireless Security Lock

ThinkGeek :: USB Wireless Security Lock: Seems like a really cool idea.

"The USB Wireless Security lock is a simple yet effective means to ensure computer access is limited to an authorized user. Each kit is composed of a USB receiver dongle connected to the computer, and a battery-powered access transmitter, which is to be carried by the authorized user. When the user moves more than 2 meters away from the computer, the security dongle will disable access to the computer until the user carrying the transmitter has returned within the vicinity of the computer."