Commodities Exchange. Chicago Mercantile Exchange. A futures exchange with all kinds of futures contracts, including commodities, equities, foreign exchange, interest rates, real-estate, and weather.
Commodities Exchange. Chicage Board of Trade. A futures exchange with all kinds of futures contracts, including agricultural, metals, interest rate, and equities.
Historical Stock Data. Yahoo! Finance. All kinds of detailed data about companies: earnings reports, projections, analyst reports, and even historical quotes.
Historical Stock Data. Google Finance. Another financial site in development.