I get asked this alot. Why are you turning your back on phpBB v2 when it has many of the features that phpBB v3 has, but it also has all these mods that I will lose? Why not stick with phpBB v2? Why ask Why
Well I am not going to get into a big long post about the different features that v3 has that v2 doesn’t. But there are some significant changes. You can look at http://www.phpbb.com/about/features/ and see. Notice how there is only 1 thing in v2 that is not in v3. Then notice all the things in v3 that are not in v2. You can see for yourself by simply installing a v3 site some where. It’s a very big improvement over v2.
Almost every major mod for v2 is either ported or in the process of being ported. Don’t believe me check out MODs in Development if the mod is not in the MOD Database Releases. You will probably find the mod you are looking for either in alpha/beta or being worked on. Sure maybe the mod you want isn’t done yet but think about how long v2 has been around vs v3. So you might need to wait awhile but it will happen.
Now for the most important reason in my opinion. Dec 2008 is on the calendar as the date for the last official release from the phpBB team for v2. In Jan 2009 the support forums will closed. In Feb 2009 phpBB will no long be supporting the product at all. They will be shutting it down. No more fixes. So that’s a good reason to move on. They have already shut the ability to release new mods. It’s ending people you need to face that facts.
Those are the reasons I started this project. I can see the writing on the wall. Plus there are the Nuke issues but I have already discussed those before and I might repost them at some time in the future. It’s a natural progression for us to move onwards and upwards.
I know lots of people are scared but it will be ok. We will get through this together 
– Technocrat