Forum Moderators: coopster
I use phpbb on several sites, and absolutely love it. You must keep up to date with the current versions, but you can completely customize it, make it Google-friendly, and there are plenty of mods and hacks you can add on as well.
I don't have any experience with IPB, but someone else may have information on it - I hadn't heard of it before. But I definitely give my votes for phpbb.
Could you also tell me if there is anyway to set up your site so that members use the same username and password on multiple places on your site....for example on your message board, on places to submit poetry, on a "personals" section (well, my personals section in not intended to be romantic), etc....