>Do you know of a similar class for retrieving currencies?

It would be easy enough to modify the StockWatch class to work with currencies, if you could find an online XML-based source for that information. Unfortunately I don't know of one offhand. StockWatch uses msnbc.com for stock quote data, but I don't know if they provide a similar service for currencies or not.

For a different type of solution, you might want to check out the FXP product on OANDA.COM at http://www.oanda.com/products/fxp/index.shtml. I have not used this product but it looks interesting.