Exchange Rates
Currency exchange rates, time plotted charts, conversion tables, calculator and historic lookups.
http://www.x-rates.com/
FXConverter - Currency Converter for 164 Currencies
Currency converter for 164 currency pairs and currency cheat sheet for travelers. Includes option to set rate depending upon conversion method used.
http://www.oanda.com/convert/classic
XE.com - Universal Currency Converter
A currency tool that allows you to perform foreign exchange rate calculations on the Internet, using up-to-the-minute currency rates.
http://www.xe.com/ucc/