SourceWatch

"Volunteer contributors continue to be the mainstay of SourceWatch, our open-source encylopedia of the people, organizations and issues shaping the public agenda. SourceWatch (formerly the "Disinfopedia") is a 'wiki,' which means that anyone (including you) can edit existing articles or create new ones about the topics of your choice. Since its launch in 2003, it has become the 14th-largest wiki on the Internet, and usage continues to grow. It now includes more than 7,400 articles. In July approximately 1.86 million pages from SourceWatch were served to web users."
Center for Media and Democracy