Google has a Finance API here http://code.google.com/apis/finance/ http://code.google.com/apis/finance/ also if you choose Yahoo http://code.google.com/p/yahoo

Google has a Finance API here http://code.google.com/apis/finance/ http://code.google.com/apis/finance/ also if you choose Yahoo http://code.google.com/p/yahoo-finance-stock-data/ http://code.google.com/p/yahoo-finance-stock-data/