You can use the stocks application to get the actual conversion rate. However the patch to get more digits of precision displayed only works in the 1.0.2 version, no fix has been found for 1.1.1 yet.
I was actually hoping for something that works offline. My widget right now can hold up to 6 currencies, you enter a number in one box and it gives you the equivalent amount in each of the other 5 currency boxes