Newer style ePassports and credit cards that use the 'Blink' system or allow you hold your card up to a reader to make purchases currently have a security flaw that allows anyone that has a handheld reader and can get within a couple meters of your card to retrieve all of the information and hack into it if they have the knowledge.
I think I'll stick with the old credit cards that you have to manually swipe for now thanks..
http://blog.thc.org/index.php?/archi...-and-RFID.html
http://freeworld.thc.org/thc-epassport/
What is RFID?
http://en.wikipedia.org/wiki/RFID