The largest message boards on the web !
Big-Boards.com is a website directory aiming at presenting to its visitors a list of the most active message boards on the web. These message boards may be ranked by post count, by members count, by post per member ratio, using only recent (previous week) data, using alexa.com ranking system, or by traffic for the boards which have included one of the big-boards trackers.

Open directory project
Dmoz.org - The Open Directory Project is the largest, most comprehensive human-edited directory of the Web. It is constructed and maintained by a vast, global community of volunteer editors.