Bolder giving - Bolder Giving's mission is to inspire and support peopleto give at their full lifetime potential.
Chronicle of Philanthropy – a news source and resource for new information and research for nonprofits and those involved in philanthropy.
The Bridgespan Group - a nonprofit to educate and inspire philanthropists through questions, case studies and best practice tools to help philanthropists make tough decisions.
Guidestar - world's largest source of information on nonprofit organizations, has IRS 990s and other data on almost every nonprofit. A good first stop.
Learn by Giving Foundation - Warren Buffet's MOOC providing the financial, technological, and intellectual tools to experience community impact and to make that knowledge widely accessible through an online forum. (Note the "grant map" that traces impact.)
Stanford Social Innovation Review – provides up-to-date articles, blogs and reviews focused on using philanthropy strategically.
TED Talk of Dan Pallotta - The Way We Think About Charity is Dead Wrong.
High Impact Philanthropic Strategies
Center for Nonprofit Excellence's steps-by-step guide Philanthropic Toolkit that helps you match your personal values and philanthropic goals to aligned organizations
Center for the Study of Philanthropy and Volunteerism - Duke University's case studies providing real world examples of strategic philanthropy.
What are the Five Most Common Traps I Should Avoid in My Philanthropy? – explores common pitfalls in philanthropy, including fuzzy headedness, flying solo, underestimating and under-investing, nonprofit neglect and satisfactory under performance, and how to avoid them.
What is High Impact Philanthropy? – explains the term "high impact philanthropy" followed by a brief exercise that illustrates the case for strategic philanthropy.