Fossil Bluetooth watch: "The Fossil Caller ID watch with Bluetooth technology keeps you connected in style by combining a vintage analog/digital watch design with Bluetooth Wireless technology. It notifies you when your phone rings with a discreet vibrating sensation and showing the caller's name and/or number on the bright OLED display."

One of the things I've been meaning to do with the X10 kit I bought a while back is to play with the idea of Bluetooth as identity - i.e. my house knows when I'm at home because there's a Bluetooth signal for me present, and knows when I'm out when there isn't.