Timex is in the news with a new watch that incorporates Speedpass technology. I talked a little about this back in December along with pet IDs. The technology here is really dinky, they could just as easily slip it under your skin, kind of like those norplant birth control implants. No wallet, no watch, heck...no clothes, just wave your hand to pay. Once this catches on big (in whatever form) you'll get the inevitable ID hijackers. Since the speedpass is a passive device, you could just as easily make your own speedpass "reader" and start scanning people's watches, fingers, or whatever to collect valid IDs to sell or hack into your own RFID clone.