I am just in the process of testing
CB + JFusion +phpBB. I've got it on a test site, and I'm still working on the phpBB configuration. I have Joomla 1.5.8 and have used a separate database for phpBB3.
Here's what I know so far:
Using JFusion you set up Joomla as the Master and the phpBB3 forum as the slave. You disable user registration in phpBB3, and you
can use the CB registration and login in Joomla.

Downside is that the CB profile is not reflected in the phpBB3 user profile, and so far I have not found any integration software that will do this. (CB connector is not for Joomla 1.5.8).

Upside is that user registrations in Joomla are synchronised with phpBB3. All registrations (past and new) in Joomla are reflected in phpBB. There is a one-way synchronisation of user logins and logouts. If the user logs into Joomla then goes to the forum, they will find they have been automatically logged in to the forum. Similarly if they log out from the Joomla site, they will be logged out of phpBB as well. But is does not work the other way. If the user logs in to phpBB, they will not be automatically logged in to Joomla. If they logout of phpBB they will not be logged out of Joomla.
Post edited by: MissyS, at: 2009/01/17 01:25