Looks like phpBB3 is finally out of beta today and ready for production.  I have been running this all semester for my classes and had no issues and updated all the way through the development process.  Its super easy to use and has a nice clean interface and easy to manage.  My only qualm is the lack of RSS feeds from the forum but I can survive without that.  I have come across a website that has free Templates for you to use instead of the default one (phpBB3Styles).  With some minor modifications it now more closely resembles my blog template.  Amazing what software you can get for free these days.  This was a super easy repository to use for school and very helpful for keeping all teammates on the same page as to where the project is.  Also provides an easy medium to share documents and keep everyone on the same version.