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.
[ ThinkGeek :: USB Wireless Security Lock ]
Apparently the software kind of sucks, so an entrepreneurial (though not money making) fellow has rolled his own.
Props to Bull (who has no blog. sniff sniff)
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Disclaimer The opinions expressed herein are my own personal opinions.