The report describes the major lessons learned and insights realised during the creation and development of the Transatlantic Community Foundation Network (TCFN), from 1999 to 2005. The Network has been established to promote the development of community foundations on both sides of the Atlantic. Based on two extensive evaluations of the TCFN conducted by the authors and designed for broad dissemination in the philanthropic world, the report describes how international, peer-based learning communities can advance philanthropy around the globe.