Barra: A general purpose source of security data, research, trading strategies, and market information . http://www.barra.com/    

Bloomberg: The site of one of the most popular data and analytic services used by the investment community. The site is a rich source of market prices, news, and analysis http://www.bloomberg.com/    

Datastream: A site providing global market indices, UK share prices and economic statistics. http://www.datastream.com    

Dow Jones Markets: This site products market quotes, Dow Jones indices, and market information. http://www.djmarkets.com/    

Securities Pricing & Research, Inc.: This site provides information on secondary market valuations of publicly-traded limited partnerships. http://www.spardata.com   

Quote.com: A site providing current price quotes on stocks, options, mutual funds, commodity futures and bonds. Quote.com is the leading independent provider of customized real-time news and stock quotes, as well as financial information services. http://www.quote.com/   

Standard and Poor's Equity Investor Services: This site provides access to the many S&P valuation services. http://www.mcgraw-hill.com/financial-markets/finprod.htm    

Zacks Investment Research: A major source of equity data. This site provides access to price data, excellent charting capabilities, and information. http://www.zacks.com/