Just wanted to say I installed phpBB2 for one of my websites yesterday and it is verruh nice. Has a nice web-page installer (once you get your db working, grr). One of the things that attracted me to it was the option to use Postgres instead of MySQL--says something to me about the level of experience of the developers (whether through this project or others).

You can see it in action (with the default skin for now) at [link|http://www.semishake.org/phpBB2|http://www.semishake.org/phpBB2]