The Citizendium (sit-ih-ZEN-dee-um), a "citizens' compendium of everything," will be an experimental new wiki project that combines public participation with gentle expert guidance. It will begin life as a "progressive fork" of Wikipedia. But we expect it to take on a life of its own and, perhaps, to become the flagship of a new set of responsibly-managed free knowledge projects.
http://www.citizendium.org/It basically sets out to be a Wikipedia with a better control over user contributions.