RFID Wardriving demo
From Hack a Day, this video demos “reading and logging unique IDs of random tags and Passport Cards while cruising around San Francisco”:
More details on this from The Register:
The $250 proof-of-concept device – which researcher Chris Paget built in his spare time – operates out of his vehicle and contains everything needed to sniff and then clone RFID, or radio frequency identification, tags. During a recent 20-minute drive in downtown San Francisco, it successfully copied the RFID tags of two passport cards without the knowledge of their owners.
…
Paget’s device consists of a Symbol XR400 RFID reader (now manufactured by Motorola), a Motorola AN400 patch antenna mounted to the side of his Volvo XC90, and a Dell 710m that’s connected to the RFID reader by ethernet cable. The laptop runs a Windows application Paget developed that continuously prompts the RFID reader to look for tags and logs the serial number each time one is detected. He bought most of the gear via auctions listed on eBay.
thanks to Vertigo Jones for the tip-off!

This makes those RFID shielded wallets and passport cases much more attractive…
Well crap. an RFID shielded wallet means using the SmartCard system my local subway system uses would take longer. On the other hand, I could certainly do without the ID theft