What is great about Yahoo is that it is not only search engine, but also an informational portal. One of the features Yahoo is offering is Yahoo Currency Converters.

This section of Yahoo is providing several useful features, among them:

• simple currency converter (web form where you pick one currency and find out how much it costs in the items of other currency, by the way - Yahoo has a huge list of currencies to choose from, that is why you will not have problems for checking even the rare world currencies)
• trading charts of USD against major currencies (Euro or Yen, by the way the charts are almost real time)
• major currency cross rates (USD, Yen, Euro, Can $, UK pound, AU $ and Swiss Franc)

Read more about Yahoo Currency Converters.