I think every blogger out there has already posted this, but it bears repeating.

The VeriChip emits a 125-kilohertz radio frequency signal that transmits its unique ID number to a scanner. The number then accesses a computer database containing the client’s file. Customers fill out a form detailing the information they want linked to their chip when they undergo the procedure, Cossolotto said.

Wired: Implantable Chip, On Sale Now