Hoover's Online
This sites allows you to search for a basic company description and contact information for over 14,000 companies. More detailed company information requires paid registration.

Hoover's Online IPO Central
Contains overview of recent IPO activity. Can search IPOs by underwriter and ticker symbol and search recent SEC filings for IPOs.

Manta.com
Claims to be "the world's largest online community for promoting and connecting small business."

Thomas Register
Manufacturing companies searchable (requires registration).

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Updated 1/4/12