[wp-hackers] For those who don't subscribe to the wp docs mailinglist:

[Scott Merrill]

David Clark said:
> I am a huge fan of phpbb, and would be glad to help with a setup for
> the wp support  forums.

Functionally, phpBB is great.  It offers a lot to users and administrators.

Under the hood, phpBB is extremely taxing to style.  Worse, it uses tables
for page layout, something that violates WordPress' stated goal of
standards compliance.