I don't know about Mtgox, but Btc-e provies it's api. With the api, you can easily pull the latest price of BTC/USD.
mtGox provides a free API with out a need for API key and I will be using mtGox and I might also average it with BTC-e.Quote
Sounds good, keep us posted 
Will do I've currently finished the PHP version! I will be finishing the Javascript and Python and then post it here (and on the main thread). I may also do a C and Ruby version.