Here's a really good article on avoiding currency conversion fees while travelling abroad that I wanted to share.

http://www.bankrate.com/brm/news/cc/20050624a1.asp

Also, I recently discovered a small bank (only in a few states, but also online) called Compass Bank who will refund ATM fees that you get charged world-wide! Worth opening an account there.

https://www.compassbank.com/personal/checking/freeChecking.cfm