CNNMoney - Market Closing Prices for Oil, Metals, U.S. Dollar and Treasury Market. Information is free and timely. Very Popular with investors and banker types.
Dun & Bradstreet - The SEC has recently breathed new life into this source of corporate financial report data. Find the complete 10Ks, 14Ds, S3s, 8Ks etc. of most public companies in the US over the last few years.
Edgar Online.Com from Cybernet Data Systems - A commercial services which provides you with a list of today's SEC Edgar filings and free copies of the most recent documents to enter the Edgar database. Can notify you of filings within minutes if they are on your watch list. A nice value-added service (some parts have a charge).
MarketEdge - MarketEdge, bringing professional information to personal investors, is the leading financial information service on the Internet. MarketEdge offers professional data at $7.95 a month - and if you join now you get one month's membership free. Find data on: Market News and Analysis, Stock Quotes, Company Reports, Company Screening, Earnings Forecasts, Insider Trading, Company Research Reports, Industry Reports, Expert Opinion and Insight, Historic Price Charts, Mutual Fund Quotes, Mutual Fund Reports, Mutual Fund Screening, Fund Market Overview, Municipal Bond News andMunicipal Bond Offerings.
Merrill Lynch Online - This is a site with a client access button, product information, as well as selected Merrill Lynch commentary and research for all users.
Morgan Stanley - Morgan Stanley provides MSCI international stock price data, among other things.
The Motley Fool - The Fool exists to inform, educate, and amuse the individual investor; to prove that the best person to manage your money is YOU; to propose that key to investment success is doing one's homework; and to show that "homework" can be fun.