I’m trying to install MediaWiki on my other site (Tag You’re It) but I must say - it’s not very easy. I have read the documentation, but it doesn’t seem to be terribly helpful.
One thing I did find, was a hack to make it so that only registered users can edit and add pages - but anyone can participate in talks. This stems from all of the controversy over Wikipedia recently - but it’s very helpful for me, since I’m converting my site from a forum to a wiki.
I’m hoping to learn a lot more about it over the next few months as I set it up and customize it, I’ll keep you all updated.
