I wanted to drop a note that dashCommerce.com is now offering the dashCommerce Currency Rate Web Service. This web service can be used by your dashCommerce store to show pricing in alternate currencies. The web services data is updated multiple times a day to help you in offering accurate price conversions. [...]

Read the complete post at http://chriscyvas.com/2008/06/29/introducing-the-dashcommerce-currency-rate-web-service/