This pendant from Fluid Forms will knock the socks off your location-crazed friends and bore the uninitiated who think GPS is an acronym for Great Public Schools.
This heart-shaped pendant, made to look like computer parts, has LEDs that flash in coordination with your heartbeat. In the future, the pendant will even be able to log data regarding your heartbeat.
Even the jewelers at Tiffany's would be impressed by the mix of precious stones and metals thrown into this PS2 controller neck pendant. The ridiculously geeky piece is constructed from 18k white gold, with 68.34ct of black diamonds lining the controller's surface.