Physics and Astronomy Forums
A series of different threaded forums for discussing famous people as well as topics related to astronomy and astrophysics.

Theoretical Physics
Archives of an discussion group for discussing related topics.

Physics Forums
Bulletin boards on physics and related subjects. Includes related polls and a list of active threads.

Scott Watson's Physics FAQs
A list of FAQs (Frequently Asked Questions) regarding Cosmology, String theory, Relativity and General Physics

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.

Groupsrv.com - Physics Forum
Discussion for scientists.

Physics & Astronomy Discussion Forums
Discussion forums devoted to physics & astronomy, with a concentration on eletricity and magnetism.