Some forums & mailing lists

Here is the list(exhaustive)--

www.linuxquestions.org

A full list of Red Hat & Fedora mailing lists --http://www.redhat.com/mailman/listinfo

Fedora forum-- http://forums.fedoraforum.org/showthread.php?t=25252
Open SuSE mailing list-opensuse@opensuse.org

Ubuntu mailing lists & forums--https://lists.ubuntu.com

http://ubuntuforums.org