Most bloggers would love to see more of a sense of community among the regular visitors to their blog. Sure, discussions sometimes take place in the comments of various posts, but it all seems a bit disorganized and they never really get off the ground. There has to be a better way to create a real sense of community on a WordPress blog.

http://www.noupe.com/wordpress/building-community-sites-with-wordpress-15-plugins-to-get-started.html