Here are some websites and publications that we use often. 

Books:

Grace, Kay Sprinkel (1997).  Beyond Fund Raising: New Strategies for Nonprofit Innovation and Investment.  John Wiley & Sons.

Seltzer, Michael (2000).  Securing Your Organization’s Future.  The Foundation Center.

Collins, Jim (2005).  Good to Great and the Social Sectors: Why Business Thinking is Not the Answer.  HarperCollins Publishers.

Periodicals and Reports:

The Chronicle of Philanthropy, www.philanthropy.com
Grassroots Fundraising Journal, www.chardonpress.com
Giving USA, AAFRC Trust for Philanthropy, www.aafrc.org

Organizations and Web Sites:

Association of Fundraising Professionals, www.afpnet.org
BBB Wise Giving Alliance, www.give.org
BoardSource, www.boardsource.org
Colorado Nonprofit Association, www.coloradononprofits.org
Donors Forum of Chicago, www.donorsforum.org
Guidestar, www.guidestar.org
IEG, www.sponsorship.com
Independent Sector, www.indepsec.org
Internet Nonprofit Center, www.nonprofit.org
NPONet, www.npo.net
The Foundation Center, www.fdncenter.org
W.K. Kellogg Foundation, www.wkkf.org

Email ann@anngoldman.com with additional suggestions.