Locate the company's main website by using Google or Hoover's Online. Note that the main home page is probably oriented toward consumers; look for links that point to "investors' information" or "about us." Especially valuable are annual reports for shareholders, 10-K reports for the federal government, and messages from the CEO.
U.S. SEC website of all required company filings; look for the 10-K (annual) and 10-Q (quarterly) reports. These reports are also linked in Hoover Online and other databases.