Here is a neat site with lots of articles on theology.
This article, called Opening the Closed Mind, is not really about theology but really just has thoughts on how to open conversation with a Jehovah’s Witnesses or anyone in a controlling religous group. The questions are to get them to think, not to start fights. Great stuff.
Here are some more audio resources (if the link doesn’t work, I found cutting and pasting the new link given seemed to work).