well, one of the best forums...
www.linuxforums.org
I am a member in this forum
Similarly, I would like to mention one more website where I am member. However, this is more often used by me because, there is more hierarchy regarding different sections and distributions....
LINUXQUESTIONS.ORG
(well, it is also available as a forum for linux on Redhat's website)
Your choice....u may add this or u may not...