I've been silently following the development of 3.1 for quite some time now, as I run a rather modded 3.0.12 on my website. I'm just drooling over the new version's capability to effortlessly perform tasks that its predecessor - while great in itself - struggled with, even after heavy modding. Wanted to let you know that the result of your hard work is absolutely beautiful
Also, I just browsed through here on my Lumia 630 (Windows Phone) - the response time and readability for the mobile version are stunning!
Seems to me that phpBB, if rather slowly, has come a long and solid way in the past few years.