Chats and Forums

Science Forums - Many topics covered; for beginners to serious researchers.
http://www.scienceforums.net/

Able2Know - Science & Mathematics - Make inquiries about science and math topics, as well participate in discussions and debates.
http://www.able2know.com/forums/ask-about71.html

Lab-monkeys.com - A community of students, technicians, post-doctorates, and researchers to have discussions of science, lab-life, careers, and education.
http://www.lab-monkeys.com/forums/

Duckalogue - Offers discussion about sports, book reviews, scientific studies, and commentaries on modern concerns.
http://duckalogue.blogspot.com/

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.
http://www.thescienceforum.com/

Element Science Community Forums - A place to post about any science-related topic.
http://www.elementlist.com/lnx/index.php?action=displaycat&catid=29

Science Chat Forum - An advanced discussion forum for science, philosophy, and related matters. Multiple forums, career announcements, and a dynamic IRC chatroom.
http://www.sciencechatforum.com/

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.
http://www.scientistsolutions.com

Groupsrv.com - Serious discussion about traditional and alternative topics in science.
http://www.groupsrv.com/science/

Plastictalk Forum - A plastics discussion forum for the plastics and rubber industry worldwide.
http://www.plastictalk.com/forum/

Science Forum: Philosophy Physics Metaphysics of Space - Science discussion of physical reality, Space and Matter.
http://www.physics-philosophy-metaphysics.com/forum/index.php

Sci-Tech.co.uk - A place to learn and discuss various aspects of science and technology and how they interact.
http://www.sci-tech.co.uk/

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.
http://www.insecthobbyist.com/

The Science Advisory Board - A global community of life scientists who convene to share knowledge and comment on emerging technologies.
http://www.scienceboard.net/forum/

PhysicsMathForums.com - Features discussions in the areas of physics, astronomy, math and philosophy.
http://physicsmathforums.com/