Foundation Directory Online Free provides grantmakers' addresses, websites, fiscal data, and more. 990 Finder directs you to an organization's IRS returns. Both services are free and easy to use.
The Grantsmanship Center (TGCI) is a clearinghouse of fundraising information and provides training in grantsmanship and proposal writing for nonprofit organizations and government agencies.
NonprofitInformation.com is a source of invaluable information from experts in the field who have extensive experience in such operations as starting a nonprofit, choosing a board, retaining volunteers and fundraising.