Foundation Center
An incredibly comprehensive database of national grants and 990’s. They also offer training programs as well as access to their library.

Another great resousource on charitable organizations including access to 990’s and other pertinent information

Chronicle of Philanthropy
Online (and print available) newspaper on philanthropic activity around the world. Lists new national grant programs for all non-profits

Association of Fundraising Professionals
Lots of articles and blogs on fundrasing topics. Great info on fundraising databases available for purchase.

Support Center for Nonprofit Management
Offers classes and courses for non-profit leaders in all areas of management to assist with career development.

Grassroots Institute for Fundraising Training
Free online resoucres and anaysis in non-profit management with the main focus on social service non-profits. Publishes a journal on social action and change.

Alliance for Nonprofit Management
A professional association of individuals and organizations dedicated to the non-proft sector. Website offers information on advocacy, board governance, executive transitions and more.