"Use your Bluetooth enabled phone or PDA as a key to automatically lock and unlock any door with ECKey. The brilliant new ECKey technology simply integrates with your existing door. After a one-time registration, your phone will automatically lock the door when you leave and unlock the door when you return, all without the press of a button."

Interesting idea, but I'm not really sold on the security of Bluetooth to secure my house. How secure is Bluetooth anyway, in terms of spoofing in particular?