Derek wrote a book Design for Community (2001). Judging by my current cash flow I might have to go down to the library to see if its there. But on his home page there are links to various articles which I guess must sumerize the book, at least to some extent.
Snippets: Make it harder to post by making the link less prominent and you will get fewer but higher quality posts. Make the rules clear so people understand if you have to delete anything. Provide good quality content and responses to get it going.
Also the psychology behind why reviewers post on Amazon confirmed my own feelings. Funny I’ve never stubbled across anything to confirm this before – most reviewers concentrate on the technology and take the user interaction as a given, which is of course rubbish.