Currency converter for Windows Phone is simple currency converter (or exchange rates calculator).
It is focused on ease of use as well as offline usage. Online update is provided via Yahoo finance. You can also manually add any kind of currency. World's widely used currencies have own flag build-in.
Currency conversion is automatic "convert as you write" style. All currencies in list have their exchange rate initially set against EUR. From all of currencies you can save your favorites and load them anytime you choose to.