A good friend of mine has been working on a book about managing online communities for several years. He’s been actually managing online communities for even longer, since 2000. Patrick O’Keefe run several successful online communities such as SportsForums.net, KarateForums.com, PhotoshopForums.com and BadBoyForums.com.
Managing Online Forums: Everything You Need to Know to Create and Run Successful Community Discussion Boards is a book about Patrick’s experience building and managing online forums.
If you run a community or are thinking of starting one, I’d suggest taking a look at Patrick’s book.