Joomla! finally moved their site’s forum over to phpBB3 this past week. This has been a long-time coming, and was promised way back when Joomla 1.5 was first demoed in early ’07. Joomla has always looked like a well-designed CMS, but the lack of native forum support has always frustrated me. Joomla has pointed out their modular system easily supports integration with any forum, and phpBB3 support would be trivial. I had looked at setting up a Joomla 1.5 + phpBB3 site and found the integration points to be anything but trivial. Reading over Joomla’s recent posts, it appears both the Joomla team and phpBB3 teams worked over several months to complete the integration; clearly more effort than they anticipated (and far more than an average user would be expected to invest).
Joomla needs to provide a turnkey install for phpBB3 forum support. Until then I won’t be using it.
EDIT: I’ve tried using JFusion to integrate phpBB3 with Joomla, following the instructions exactly on a fresh install … no go, Joomla and phpBB3 still maintain separate user DBs.