Yesterday Helgi and I gave a workshop on RAD with PHP. The central project was an example forum that Helgi and I threw together. Helgi had the backend working, while I only had a few basic templates done. Unfortunately this crossed somewhat with my studies, so I didn't have as much time as I wanted to prepare the frontend. However, I think the backend and theory were good enough to present our topic.
I'll try to recap the entire session and provide a link to the appropriate code here later.
Some attendees of yesterday's workshop indicated further interest in the presented example project. As a result, Helgi and I will be continuing to develop it. It currently is under GPL, but considerations will be made to license it otherwise on specific request.