The financial information comes from the IRS 990 forms. The Foundation Center is a non-profit organization devoted to serving the information needs of grantmakers and grantseekers. They publish an extensive list of books and provide libraries and training sessions related to the non-profit sector. This is a project of the American Institute of Philanthropy. The goal of the I.N.C. is to provide info about nonprofits free of charge.
Information includes listings of agencies by name, purpose and, geographic location.
They also list the state charity registration offices for each state. A great compilation of resources of interest to non-profit public service organizations. Includes information about funding sources, management, volunteers, relevant listservs, and much more. This site has compiled the Frequently Asked Questions from the newsgroup soc.org.nonprofit and also provides links to sites of interest to non-profits. AScribe Provides journalists and the public with access to news from U.S. academic institutions, research centers, foundations, public-policy groups and other nonprofit organizations.