You may or may not also be interested in some of the projects discussed at:

http://online-deliberation.net/

and in some of the projects linked from:

* http://www.communitywiki.org/ArgumentMap

* http://www.communitywiki.org/en/MappingArguments

* http://www.communitywiki.org/en/DebateTool

* .. and other related pages at that wiki