excellent column by NPD's Ross Rubin) have taken the opposite tack: for one week in February, they've transformed the famous Tower Bridge into the world's largest Bluetooth device (narrowly edging out the PS3). Using multi-colored lights strung across the length of the upper walkway, technicians have created a gigantic interactive exhibit wherein sensors located at either end detect travelers' Bluetooth-enabled gadgets (cellphones, laptops, PDA's, etc.) and then track their progress in pseudo-real-time as they move across the bridge. Visually, the movement is represented by a uniquely-colored pixel appearing at more-or-less the same spot on the walkway as the device; to a faraway observer, it would look like this single "pixel" was making the journey from one end to the other. In order to ensure device anonymity, the Bluetooth sensors only send a derivative of each device's MAC address to the bridge's main controller, so consider this a Bluesnarfing safe-zone. If you're in the area and want to check this out -- or love Bluetooth enough to buy a plane ticket (any BT fanboys out there?) -- you'd better hurry, as the project ends and the bridge goes dark tomorrow.