CenStats:  U.S. Census Bureau  
Several databases of demographic and economic information, including Building permits data, International Trade data, Detailed Occupation by Race, Hispanic Origin and Sex, USA Counties data, Nonemployer Statistics and Census Tract Street Locator.

Consumer Expenditure Survey
Provides information on the buying habits of American consumers, including data on their expenditures, income, and consumer unit (families and single consumers) characteristics.

2007 Economic Census on American Factfinder
The Economic Census profiles American businesses every five years, from the national to the local level.

Ernst & Young
Market research on many different industries.

Industry Information
This page includes links to statistics, forecasts and news for specific industries.

ZIPskinny
This site takes data from the 2000 census and allows you to search by ZIP code to see demographic information (income level, marital status, racial breakdown, etc.) and then compare it to other areas.

Also, look for articles about industries and consumer behavior in our business periodical databases http://www.bpl.org/electronic/business.asp. And ask the librarians at Kirstein about our many print market research resources.