Hi guys,
I recommend you spend some time playing with this new forum software being developed: xenforo. It's currently alpha. It'll be commercial. Look at (a) the developers' statements on their philosophy on forums (b) their implementation of that philosophy.
They're all about discussion and participation, ease of use, and a very polished user experience, one that entices you to get involved.
Notice also that their system has only been publicly viewable for about two months, and look at the webmasters drooling and getting excited about it. Look how many member registrations and suggestions have been made already. Read the passion from the posters there, most of whom are webmasters of various other forum packages.
Please don't dismiss it as just fancy looks and a good UI, but pause to reflect on what they're doing which evokes such a response, and whether some of those principles could be brought into phpBB v4.x.
- g



