A quick google search shows several currency converter sites; some offer the rates on a table, some will email you the new rates daily. Any of these methods, along with tools like HTML::TableExtract will help you get the rates. But you'll need to read the various pages to make sure that such a use is an acceptable use by their user policy (A quick check at a few do not allow you to reuse their information).

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
It's not what you know, but knowing how to find it if you don't know that's important