http://www.projectw.org/
http://www.sciencemadness.org/
http://www.roguesci.org/theforum/index.php username: Humbleman
http://forums.studentdoctor.net/
http://www.scienceforums.net/forum/
http://forums.hypography.com/index.php
http://www.thescienceforum.com/
http://www.lab-monkeys.com/forums/
http://forum.physorg.com/index.php
http://www.physicsforums.com/
http://4hv.org/e107_plugins/forum/forum.php
http://www.everything-science.com/sci/Forum
http://www.eng-tips.com/
http://forums.philosophyforums.com/
http://conworlds.info/cwbb/
http://www.advancedphysics.org/forum/
http://www.plastictalk.com/forum/
http://www.electronics-lab.com/forum/
http://www.avsforum.com/
http://forum.wolframscience.com/
http://chemicalforums.com/
http://www.thenakedscientists.com/forum/
http://sciforums.com/
http://www.nitrogenorder.org/cgi-bin/forum/forum.cgi
http://www.artofproblemsolving.com/Forum/index.php

http://community.boredofstudies.org/
http://www.thestudentroom.co.uk/index.php

http://slashdot.org/ username: the_kanzure
http://www.gamedev.net/
http://www.allegro.cc/

Even older from '03 was the DarkBasic community, but no longer does that seem to be of any use. Too, there was once the GameShark community, which has been erased and replaced in the last seven years with something 'worse' (or maybe I only see it clearly now). Gaiaonline.com, too. Can't forget that.