Advanced Physics Forums - Intended primarily for physics majors, graduate students, postdocs and faculty. Get meeting information, theoretical and research information and exchange of ideas. Meant for the physics community throughout the world.
Physics Forums - Bulletin boards on physics and related subjects. Includes related polls and a list of active threads.
PhysOrg Discussion Forum - Applied physics, nanotechnology, quantum physics, and semiconductor technology. Also discussions of the latest physics news.
Scott Watson's Physics FAQs - A list of FAQs (Frequently Asked Questions) regarding Cosmology, String theory, Relativity and General Physics