The best, safest and most accurate currency converter is provided by Google:
http://www.google.com/help/fea tures.html#currency
Sure, there are tons of currency converters available on the internet, but Google's currency conversion feature is easy to use and the most reliable that you'll find.
If you need a currency converter for your Palm Pilot, you could try the FXPilot by OANDA (http://www.oanda.com/products /fxpilot/fxpilotintro.shtml).
This program automatically updates itself with the latest conversion rates, and features a "cheat sheet" feature for travelers!