Easy, light, powerful, secure!
It is ready to download and install on your WordPress the WordPress phpBB integration plugin – WP w3all phpbb page at WordPress plugins
Easy and extended documentation available here:
A WordPress phpBB integration done with this plugin, give you:
Login/Out and registration for users between phpBB and WordPress
Latest forums topics to display on blogs pages
WP users transfer to phpBB
phpBB template integration into WordPress