Yahoo! Finance
At Yahoo! Finance, you get free stock quotes, up to date news, portfolio management resources, international market data, message boards, and mortgage rates.
Google Finance
Google Finance offers a broad range of information about stocks, mutual funds, public and private companies.
CNNMoney Pre-Market
Coverage of pre-market trading including futures information for the S&P, Nasdaq and NYSE.
NYSE Euronext
Home of the New York Stock Exchange, the United States' largest stock exchange.
Nasdaq
Official site of The NASDAQ Stock Market featuring free stock quotes, stock exchange prices, stock market news, and online stock trading tools at NASDAQ.com.