Workindex
http://www.workindex.com
Labor and personnel issues in the workplace. Partnership of Cornell University's School of Industrial and Labor Relations and Human Resource Executive magazine.

American Management Association
http://www.amanet.org/

Management Link
http://www.inst-mgt.org.uk/external/mgt-menu.html
"bringing together management sites on the world wide web"

U.S. Business Advisor
http://www.business.gov/busadv/index.cfm
Created by the Small Business Administration (SBA), the National Partnership for Reinventing Government (NPR), and the U.S. Business Advisor interagency task force.

Bplans.com
http://www.bplans.com/
Business and marketing plans.