Spent an hour configuring/setting up Phorum on my PHP site. Quite a nice package, and fairly easy to configure. It takes a bit too much playing inside the source code, but the results are well worth it.
You may be wondering why I put closing HTML tags on the first line. This was to see if I could prevent someone else's entry from reformatting my own. Sadly, they seem to be escaped. I don't know what would happen if some bad HTML were <u>actually</u> placed in front. Oh well.