Hi,
I'm just about to begin managing a mini-forum on our website.
There's a really great reference book I've been reading called Managing Online Forums by Patrick O'Keefe.
The website:
www.managingonlineforums.com
I agree with paultgreen - it's got to be relevant but also interesting and up-to-date. People will never use it if the last post was written 3 months before.
I guess it depends if you have the time to commit to it.
Kim