Science Forums - Many topics covered; for beginners to serious researchers.
Able2Know - Science & Mathematics - Make inquiries about science and math topics, as well participate in discussions and debates.
Element Science Community Forums - A place to post about any science-related topic.
Lab-monkeys.com - A community of students, technicians, post-doctorates, and researchers to have discussions of science, lab-life, careers, and education.
Plastictalk Forum - A polymer discussion forum for the plastics and rubber industry worldwide.
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 Chat Forum - An advanced discussion forum for science, philosophy, and related matters. Multiple forums, career announcements, and a dynamic IRC chatroom.
Science Forum: Philosophy Physics Metaphysics of Space - Science discussion of physical reality, Space and Matter.
Sci-Tech.co.uk - A place to learn and discuss various aspects of science and technology and how they interact.
The Science Advisory Board - A global community of life scientists who convene to share knowledge and comment on emerging technologies.
PhysicsMathForums.com - Features discussions in the areas of physics, astronomy, math and philosophy.
Scientist Solutions - Features discussion board topics for analytical chemistry, anatomy, physiology, biotechnology, biochemistry, bioethics, bioinformatics, biophysics, cell biology, cell transduction, molecular pathology, genetics, genomics, immunology, microbiology, neuroscience, and pharmacology.
Duckalogue - Offers discussion about sports, book reviews, scientific studies, and commentaries on modern concerns.
Science Reloaded - Discussion board covers topics including engineering, physics, cryptography, inventions, and alternative science concepts.
Research Scholar Forum - Private group. Discussion topics include research projects, ideas, information, conference notices, fellowship award announcements, and examination details.