The FDA approval of RFID implants made headlines yesterday, but so far, my favorite post about it belongs to Phil Libin with his post: FDA approves giant pennies. As expected, slashdot has a post about it as well: FDA Approves Implantable RFID for Patients.
Something to keep in mind when reading headlines about tagging patients, is that the RFID chips themselves have nothing to do with hospitals and doctors: It is nothing more then implanting a broadcast-able ID into humans -- which is just slightly more invasive then a bar-code tattoo. At least it makes it easier for The GAP to identify you then using retinal scans!