The Catalogue for Philanthropy. The Harman Family Foundation publishes a catalogue for the Greater Washington area each fall. It highlights 70 smaller nonprofit organizations.
http://www.catalogueforphilanthropy.org/dc/2003/

The Foundation Center. The website and the library collections, one of which is located in downtown Washington, provide a wealth of information particularly on foundation funding sources.
http://fdncenter.org/

Grantmakers in Aging.
http://www.giaging.org/

Grantmakers for Effective Organizations.
http://www.geofunders.org/

Public Welfare Foundation. Resources section. An excellent guide for prospective grantees seeking funding from foundations, written by a foundation officer.
http://www.publicwelfare.org/resources/fundraising.asp

Washington Council of Agencies. Please see the council’s initiative on executive transitions.
http://www.wcanonprofits.org/

Washington Regional Association of Grantmakers. Please see resources section. There is a standard application used by many funding sources in the Washington area.
http://www.washingtongrantmakers.org/

W. K. Kellogg Foundation. The resource section of the foundation's Web site provides very useful guidance to nonprofits on program evaluation, communications planning, and public policy.
http://www.wkkf.org/