Mark Roques has been developing an approach to worldviews and evangelism utilising subversive questions. He outlined his approach at the recent Crossroads conference at Trinity College, Bristol - his talk is available here.
He has also been developing and writing some materials to develop this approach. They will be brilliant for schools and youth workers. He has over a dozen available and is working on producing many more. One of them is available as a taster here:
If you know of any publisher that would be interested in Mark's materials get in touch!