This is an excellent plugin!
Since there aren't that many actively supported MODs for phpBB, I have to do certain things through WordPress such as adding a calendar with the possibility for users to add their events.
Thankfully this plugin lets me synchronise phpBB accounts with WordPress so that users that register on my forum can make use of the aforementioned WordPress features without having to make a separate account for that.
I hope you will continue to update and support this plugin as this is a must-have for any decent site built on WordPress with a phpBB forum! :)