Nonprofit Times
Chronicle of Philanthropy
Minnesota Council for Nonprofits
Philanthropy News Network Online
Nonprofit Issues
Center for Community Change
CharityChannel
Guidestar/Philanthropic Research Inc.
About.com - Guide to Nonprofit Charitable Organizations
Community Action Partnership

Association of Fundraising Professionals
Internal Revenue Service
BBB Wise Giving Alliance
American Institute of Certified Public Accountants
Community Wealth
Contributions Magazine
Custom Development Solutions
Global Partners for Development
InterAction

Education/Research

Seton Hall University - Nonprofit Institute
Association for Research on Nonprofit Organizations and Voluntary Action
National Center for Charitable Statistics
Nonprofit Sector Research Fund, Aspen Institute
American Humanics
Management Assistance Program for Nonprofits
Yale University's Program on Non-Profit Organizations
Nonprofit infotec.org

Nonprofit Jobs Cooperative
OpportunityNOCs.org
American Society of Association Executives
Monsterboard
Community Career Center
DevelopPro.com
DRG (Nonprofit Executive Search Firm)
ExecSearches.com
Greater Washington Society of Association Executives
Hspeople
National Association of Corporate Directors (NACD)
Bridgestar

IBoardroom
Internet Nonprofit Center

National Association of State Charity Officials
Council on Foundations
Idealist.org
Points of Light Foundation & Volunteer Center National Network
Independent Sector
Foundation Center
Philanthropy News Network Online
BoardSeat
Delaware Association of Nonprofit Agencies (DANA)
IGC (Institute for Global Communications)
National Center for Family Philanthropy
National Issues Forums
United Way of America
National Urban League
Nonprofit Resource Guide: A Directory of Organizations Serving Nonprofit
San Diego Grantmakers

Skills Training/Instructional Products/Management Support

Association of Consultants to Nonprofits (ACN)
Volunteer Consulting Group
Nonprofit Managers Library
National Association of Parliamentarians
National Council of Nonprofit Associations
InnoNet
Nonprofit Resource Network - Iowa
CompassPoint
Grantmakers for Effective Organizations
Society for Human Resource Management
Service Corps of Retired Executives
Energize Inc.
Aspen Institute
Alliance for Nonprofit Management
Association Management Services, Inc.
Charity Village
Governance & Management PTY LTD
Impact Online
National Organization for Competency Assurance
Nonprofit GENIE
Board Builders
Nonprofit Resource Center, Sacramento, CA
Nonprofit Support Center, Santa Barbara
Nonprofit Management Solutions, San Diego
Nonprofits' Insurance Alliance of California, Santa Cruz
Leader to Leader Institute
Youth on Board
Support Center for Nonprofit Management in New York
Board Network - Maine