FINRA . http://www.finra.org - The Financial Industry Regulatory Authority (FINRA), is the largest non-governmental regulator for all securities firms doing business in the United States. FINRA was created in July 2007 through the consolidation of NASD and the member regulation, enforcement and arbitration functions of the New York Stock Exchange.
EDGAR - http://www.sec.gov/edgar/searchedgar/webusers.htm - Search for SEC filings.
Securities and Exchange Commission http://www.sec.gov - Protects investors and maintains the integrity of the securities market.
Securities Law Home Page http://www.seclaw.com