WP-United integrates phpBB and WordPress to make a social site. Enable any of these modules: sign-on, theming, widgets, cross-posting and behaviour.
I've been using wp-united on two different websites since 2007, started with version 0.8. The 0.9.x series is better than ever and makes setup much easier for the end-user. If you use wordpress to blog and have forums to supplement it, you should get this mod a serious look.
The best feature? The support from the author!
Whether you want to make your WordPress a lot more social, or give phpbb a good looking, accessible landing area, nothing beats WP-United. So glad it's back.
I just installed and integrated my WordPress website and phpBB3 forums. Works perfectly.
Been waiting for this, absolutely loving it!