Another option is to run an remotely hosted forum, such as an ezboard (
http://www.ezboard.com ) which you pay, I think like 30 bucks every six months so about 5 bucks a mo. If you start getting insane traffic, they have an automatic system the analyzes how much more you should have to pay, but even then I don't think it's much more. You really don't have too much control over the software end of things (other than some custom html/javascript), but for someone who knows nothing about PHP and doesn't want to learn, it would be a good choice.