If you go to yahoo finance and to the currency converter, they have very small pocket guides that are designed to be printed out.
I printed out two each for USD to EURO, USD to pounds, USD to Czech and USD to Swiss.
The guide shows 1, 5, 10, 50, 100, 150, 500, 10000 increments. Really easy to figure out the prices in forgeign countries.
I'm going to stick one of each in my day pack and then one in my money belt.
I would give you a direct link but the link won't work.