Joomla Forum has just been reviewed and you can consult the 4 pages of this article on Joomla Forum Review.
An updated version has been installed as well to let you test and discover this software via the Joomla Forum Live Demonstration.
Drupal is not the only CMS that provides nice forum integration. Joomla is the other heavy weight product of the market, and the different solutions provided as components to give users access to a forum to your website are quite powerful and complete. We have reviewed Joomla, with its forum plugin Agora, that is the most recommended one on the Joomla Extensions website.
You can consult it here :