http://www.entreworld.org/
The Kauffman Center for Entrepreneurial Leadership maintains this extensive resource

www.sbaonline.sba.gov/
The Small Business Administration site.

www.sbaonline.sba.gov/gopher/
Developing your Business Plan Workshop

www.herring.com
Directories and information from Red Herring

www.paloalto.com/
Palo Alto Software produces business planning software. This site includes useful tips.

www.bplans.com
Includes sample business plans, and other tips.

The following published material provides useful guidance for business plan development:.

Writing a Convincing Business Plan by Art Dethomas, Lin Grensing-Pophal

Business Plans That Win $$$: Lessons from the MIT Enterprise Forum by Stanley R. Rich