There is some good information making the rounds of the net right now, involving a guy implanting an RFID tag in his hand so that he can automatically unlock his car door.
RFID (Radio Frequency ID) tags are very small (the size of a grain of sand) antennas that can receive and respond to radio-frequency calls from an RFID transceiver.
More info on RFID tags is here: http://en.wikipedia.org/wiki/Rfid
. We've brought them up on the board before, in an "anti-Walmart" thread. Walmart inserts RFID tags into some of their products for tracking purposes, much to the dismay of consumer rights and privacy advocate groups.
Anyway, someone surgically implanted an RFID tag into his hand, so that whenever he reaches for his car door handle, it automatically unlocks.
This isn't the first application of biometric car entry devices. Car door locks that function on fingerprint identification are already in circulation. You might have recalled the recent news story in which a person had their finger removed, so that thieves could use it to bypass his fingerprint-identification door lock. More info on that is here: http://news.bbc.co.uk/2/hi/asia-pacific/4396831.stm
There's plenty of info on the keyless entry RFID tag guy. Here are some links:
RFID implant photo set:
Article on Body Modification Ezine website:
Detailed info from the implantee, including videos of the keyless entry unit in operation:
RFID industry news is here: