It's missing some helpful features, but this currency-conversion application can effectively and accurately provide up-to-date exchange rates of money from around the world.
Currency has a trim interface that displays the current exchange rates of 18 different countries along with their flags. The program can quickly and accurately compute conversions of any monetary value between the available countries of your choosing. Currency connects to the Internet for automatic updates.
Some users would appreciate a longer list of countries, plus full names rather than just abbreviations. The program misses a few beats, but it's free of charge and OK for quick lookups by financial watchdogs and world travelers.