An idea! I want a social network debate website!
I want a site where registered users can debate an issue so that the structure of the debate is apparent. You'd start with a controversial position (e.g. "The war in Iraq was launched in bad faith,") and users would be able to make pro and con arguments that would be displayed in a tree hierarchy, with each argument spawning its own argument children.
Using dhtml, or some other sort of interwebnet magic like they do for Google maps, you'd be able to zoom in or out to see the whole argument represented as a cluster of nodes or zoom in to read any node's summary (user provided) or its full text. Each node would have it's own hyperlink footer space for citations.
And I'd like a pony, since I'm asking.