Roberts Rules of Order The official recognized protocol for meetings and conducting nonprofit business
http://www.idealist.org/ organization that provides networking, acquaints you with 37,000 nonprofits, lists consultants, job opportunities in the nonprofit sector, volunteer opportunites
http://www.networkforgood.org/npo/ is a nonprofit collaboration to help nonprofit organizations increase capacity, reach new audiences, and build Internet strategies
http://www.nonprofitresources.org/ working to increase the effectiveness and efficiency of nonprofit organizations by providing a range of high quality management support services that address the needs of staff and volunteer leadership
http://fdncenter.org/research/npr_links/ The Foundation Center, including good grantmaker sites
http://www.cnrohio.org/ The Center for Nonprofit Resources, Dayton, OH
http://www.geocities.com/center_nonprofit/ The Center for Nonprofit Resources, New Orleans, LA Board Development, Organization Assessment, Program Development, Fundraising
http://www.firstgov.gov/Business/Nonprofit.shtml The government's resources
http://www.not-for-profit.org/ Covers legal and board of directors issues; support organizations; finance, accounting, and management
http://www.indra.com/nnr/books.html Northwest Nonprofit resources - good list of books
(more coming)