When I travel for Santa Barbara Chocolate Company I'm usually gone in two week increments and generally visit three European countries. I've discovered that the best way to handle the currency conversion while saving the most on the transfer rate between Dollars, Euros or Sterling is to make your purchases as much as possible on your credit card (American Express is my preferred card while Visa and Master Card is more widely accepted in Europe). Also use your ATM card instead of taking cash and exchanging at a currency converter. Big name banks (i.e. Rabobank or HSBC) located in the city centers are the best option for an ATM withdraw (airport banks don't give as good as an exchange rate). Travelers checks are a great option but they are not as widely accepted as a credit card.