Here's my solution: http://staff.washington.edu/netghost/stocks.rb The application bit is a little unpolished, but it has some neat features: -Lookup stocks: view goog, msft -Buy/Sell multiple stocks: buy 10 goog, 20 msft -Get a history of transactions: history goog Anyways, this was pretty fun, and I even found a compelling use for OpenStruct, neat. .adam