Lars Wirzenius seems to be seconding my idea for using wikis to solve contentious issues.
My latest idea in this regard is to have several wiki pages, one for each opposing view and one for agreed facts. If an issue has multiple parties debating it then there could be multiple pages for the areas on which different sub-groups agree.
The plan is that each faction edits their own page along with email discussion with other factions and then the page of agreed facts is updated when agreement is reached on some points.
I plan to set up a wiki and do some experiments to see how well this works.