Google has rolled out Google Finance to compete with MSN Finance and Yahoo! Finance amongst others in offering free online financial information. I haven't spent alot of time looking at it, but it does seem to offer a much cleaner interface than Yahoo or MSN. Click and drag stock charts are rather cool. Unfortunately, other than interpreting the chart, it doesn't seem to offer daily open and close prices. However, there is good information here and it's easy to find. Public company information includes news, financials back a couple of years, key stats, discussion, and links to blogs. There is also some limited private company information as well. A link to more information, however, takes you to Hoovers. This provides a good alternative to Yahoo and MSN's financial offerings.
Google Finance
FAQ