Another thing you can do very cheaply. If you have credit/debit cards in your billfold or elsewhere on your body with the little wi-fi symbol on the back, they are not safe from RFID readers. You can get credit card holders that have a copper lining that you can slide your cards into and they are shielded from the readers. I think Wal Mart has them but not sure. I got mine for free from the guy telling us about them at a security briefing last August.
