Connecticut Technology Council - "A statewide association of technology oriented companies and institutions." Includes a searchable database of Connecticut technology companies. Search by name, industry, sales revenue, number of employees, city or keyword.
EDGAR - A database of corporate information, including SEC fillings.
Gary Price's List of Lists -"A database of ranked listings of companies, people and resources freely available on the Internet. Content comes from a number of sources including: Specialissues.com, Gary Price's "ResourceShelf" and individual users of the LOL." The organization of the List of Lists is by subject headings based on the two-digit 1997 U.S. NAICS Codes.
Hoover's - Search for business information by company name, ticker, keyword, or executive name. Or browse by companies, industries, stock index, geography or the business boneyard. Basic information is free.