The Contactless chip is just another name for rfid which is spreading rapidily accross the globe. The verichip, a human implantable RFID chip has already been implanted in thousands of humans worldwide including patients, government workers and even nightclubbers who use it for entrance and to pay for drinks.
The future is here, although my main concern is that The Verichip is set to replace The Mandatory ID cards that are now being brought into effect.
See here for more information – http://noidchip.free-forums.org/noidchip.html