Interesting idea -- seems there is something in the "ether," as a LinkedIn connection just started posted her new company here: http://www.mystilla.com http://

Interesting idea -- seems there is something in the "ether," as a LinkedIn connection just started posted her new company here: http://www.mystilla.com http://www.mystilla.com They use BLE devices with motion sensors which attack the same use case. I like your idea better because it uses the built-in hardware just for laptops. Not sure about what @betafish posted tho.