http://www.expertbusinessseller.com/ Practical "Do-It-Yourself" Buying or Selling any small to medium sized business.
www.google.com/patents Research your idea. See other similar products.
http://www.thefundingedge.com/ Online tool prepares any business for Investors.
http://www.entrepreneur.com/ Business Magazine for Entrepreneurs.
http://www.sba.gov/ US government site that helps small businesses through planning, info and loans.