Communities Featured:
Community Platform Options:
Forums/Message Boards: Wikipedia's list of Forum Software
Groups/Email Lists: Wikipedia's page on Email Lists
Blogging Platforms: Wikipedia's list of Popular Blogs showing platform used
Community Software: Wikipedia’s list of Collaborative Software and Comparison of Social Networking Software
Resources for building/nurturing community:
Community Building on the Web : Secret Strategies for Successful Online Communities by Amy Jo Kim
For a deeper understanding of points, badges, and reputation: Building Web Reputation Systems by Randy Farmer and Bryce Glass
If you decide to implement features: Building Successful Online Communities: Evidence-Based Social Design by Robert E. Kraut
For Moderation best practices: The Community Roundtable Research Page
Other resources:
On guidelines: The Universal Rules of Civilized Discourse