phpBB integration solution

An integrated phpBB forum will never be as tightly integrated as a native Drupal forum within a wider Drupal site. But it may be the best solution for people who

• have a phpBB installation which has a lot of traffic and too much data to migrate efficiently (though the module above has been tried on fairly large phpBB boards),
• who, more often, just don't like the default Drupal forum and prefer the feature set offered by phpBB.

See the integrated phpbb project home page here:
http://drupal.org/project/phpbb

See also phpbb, a Drupal group on phpBB integration.