Know what RFID is? If you travel, you reall should know!
RFID stands for Radio Frequency Identifcation. Credit card companies and governments are putting ID chips in your credit cards and other identification for easy scanning. At the airport wave your passport in front of the scanner and all the info goes into the airline computer. But thieves can use equipment to capture that info too. Experts say a thief can lift the info on your RFID while its still in your pocket, without you even knowing about it. These wallets inhibit those radio frequencies from being read until you take out your card or passport. Think Geek has RFID inhibiting wallets in both leather and stainless steel and they even have a stainless steel sleeve to protect your RFID passport. Price start at $20 and run up to $75.
This is the leather wallet: http://www.thinkgeek.com/gadgets/security/8cdd/
Thsi is the stainless steel wallet: http://www.thinkgeek.com/homeoffice/gear/a7a2/