Banks
NYC Banks: Directory of Banks in NYC, Banks in New Jersey. Saving and Loans.
 
Better Business Bureau
Better Business Bureau of New York
 
Chambers of Commerce
Chamber of Commerce Serving Greater New York
Bronx Chamber of Commerce
Brooklyn Chamber of Commerce
East Manhattan Chamber of Commerce
Queens Chamber of Commerce
West Side Chamber Of Commerce

Commodities exchange
New York Mercantile Exchange: New York Mercantile Exchange is the largest physical commodity exchange. (Manhattan)
 
Financial Centers
World Financial Center: The World Financial Center is located in Lower Manhattan's Battery Park City.
 
Stocks
New York Stock Exchange (Manhattan)