My website contains a forum, and i found this great site that will automatically install a forum, you just need to upload the files to your file manager.

The most useful thing i found using this type of forum is a cool modification that a user made. Its called ad management and allows you to manage and include ads easily in a forum.

All you have to do is enter the html code of the ad into the ad management and then it gives you options about where to place the ad and will automatically do it, its a massive time saver.

If you are considering include a forum component to your site, i definetly recommend this forum setup and then using the ad management mod. I spent hours trying to get my ads to fit nicely in the forum, with this mod it takes less then 5minutes.

Ad Management Mod:
http://custom.simplemachines.org/mods/index.php?mod=255

More about SMF forums:
http://www.simplemachines.org/