Web Sites
Michigan's premier government online service dedicated fully to the successful operation of new and existing businesses.   Everything you need to do business in our great state is right here in this one stop shop -- from information about licensing and permits, to tax registration and unemployment insurance.  
Economic Census 2007 | 2002 | 1997
Provides a detailed portrait of the U.S. economy once every 5 years. Data can be used to gauge the competition, calculate market share, locate business markets, assist in site location, design sales territories, and set sales quotas.
 
Over 500 free sample business plans.

United States Small Business Administration
Provides a sample outline of a business plan including links to sample plans.