I made a simple program to pull the current market values from tradehill and bitmarket....as of right now, it's still in very early stages, so it literally does NOTHING else (including no autorefreshing or anything fun like that....yet.....) however I figured some people may find this a bit more useful than trying to pull two separate values to find out where to buy or sell coins at...also before anyone asks, yes, I am in fact trying to get MtGox in there as well, however their API just isn't cooperating with me......hopefully in the near future.
https://github.com/dubbz82/Bitcoin-Price-CalculatorImage (note, I still don't have much on the order of "calculator" functionality...it's still in the works):