It's a great simple forum. The only forum tools that seem current are this one and Kunena. Ninja board is not ready for 1.7 and I could not get it working in 1.5. CCboard seems abandoned by the developer.
My only concern is that this project might not last more than 2 years, and some websites desire forums that archive messages for 5+ years. People might join Achim to grow his tool, as the need is there.
I'd change the name to fishforum or ezforum or something fun.