I've set up a test phpBB3 forum, and imported the data from this forum to it.
Have a play, put don't use it for regular posts, as the whole lot will be purged when we do shift over.
I haven't done any graphics or colour tweaking yet, it's exactly how phpBB3 comes "out of the box".
Have a play, and make and comments/suggestions before we move. This way, we can iron out any initial problems before doing the "big switch"
One big difference is, it now supports file uploads (although I'm not sure if I've enabled it properly yet), and we can have forums within forums to any number of levels (so will probably add state based forums within the "Gatherings" forum...)
Browse to http://liberty.asn.au/phpbb3/index.php
Here's a quick rundown on the differences between phpBB2 and phpBB3. http://www.phpbb.com/about/features/