Arphids = RFID chips. (Hat tip to Corey Doctorow's "Little Brother" for the term "arphids". It's an excellent book.)
Watch as Chris Paget drives around San Francisco and steals RFID numbers from U.S. Passport Cards, then goes on to explain how they can be correlated with, say, RFID-enabled credit cards to facilitate identity theft.
Thanks, but I'll stick with my paper passport and mag stripe credit cards.