Lumpy Burgertushie wrote:haven't checked, but do you get anything with that very expensive xenforo that you do NOT get with or can not add to phpbb in about 5 minutes?
Spam cleaner: below each post there is "spam" button (admins and moderators only). Click it to delete all posts from that user and ban him. Very convenient way to get rid of spam.
WYSIWYG editor that works and is very easy to use.
Plugin system that is years ahead of anything, including phpBB 3.1 system. Other plugin systems are based on hooks that allow to insert code only to few specific places. XenForo has fully OOP code, its plugin system is based on allowing to extend any class. You can chain extend same class from several add-ons that don't know about each other without causing conflicts. Modifications to templates are done several ways: with hooks (deprecated), template modifications (string or regexp replacements in templates with optional callback), events that let add-on author change HTML output. Add-ons can do almost anything and writing add-ons is very easy.
You can see more stuff here: http://xenforo.com/community/forums/have-you-seen/
Some of those tutorials have screencasts