Data:

• finance.yahoo.com (Stock information and data)
• google.com/finance (Stock information and data)
• MSCI Barra (Data for the MSCI index family)
• Chicago Board Options Exchange (Data on several volatilty indices)
• Russell Investments (Data for the Russell index family)

News:

• Financial Times (Some content only avaliable to subscribers)
• Wall Street Journal (Some content only avaliable to subscribers)
• New York Times Bussiness Section (All content for free!)
• Bloomberg
• Reuters Finance