Groupsrv.com - Serious discussion about traditional and alternative topics in science.
InsectHobbyist - An independent online community of Insect and Arachnid hobbyists, businesses, keepers, breeders, and organizations. Chat rooms, WebRadio, classifieds, feature pages, and lots of forums. Part of the PetHobbyist community.
Lab-monkeys.com - A community of students, technicians, post-doctorates, and researchers to have discussions of science, lab-life, careers, and education.
LabRoots - Social networking site that enables scientists, engineers, and other technical professionals to connect, collaborate with, and learn from each other.
PhysicsMathForums.com - Features discussions in the areas of physics, astronomy, math and philosophy.
Plastictalk Forum - A plastics discussion forum for the plastics and rubber industry worldwide.
The Science Advisory Board - A global community of life scientists who convene to share knowledge and comment on emerging technologies.
Science Chat Forum - An advanced discussion forum for science, philosophy, and related matters. Multiple forums, career announcements, and a dynamic IRC chatroom.
The Science Forum - Discussion topics include astronomy, cosmology, biology, chemistry, earth sciences, physics, social sciences, health, medicine, history, economics, business, engineering, computer science, math and environmental issues.
Science Forums - Many topics covered; for beginners to serious researchers.
Scientist Solutions - Discussion board primarily focused on the life sciences and related fields, intended for and moderated by scientists.
Sci-Tech.co.uk - A place to learn and discuss various aspects of science and technology and how they interact.
Survival Blog for Scientists - Professional scientists write about their scientific life with the aim of giving others tips on how to survive in science.