On Saturday, I had the pleasure of meeting David Price, the founder of Debategraph. It's a fantastic idea, and it's really getting there as a means of getting participants to identify and weight issues.
If you get a chance, have a play around with it. This is a map of the issues surrounding the Arab-Israeli conflict - each element itself has it's own set of relationships and sub-issues. It tells you a good deal about the perception of the issues - a valuable bit of info in itself.