Those looking at wikis … well, everyone really, should have a look at Debategraph.
The Debategraph works like a structured argument map, but it has a wiki underlying it that lets anyone contribute to the debate. The map is rendered in Flash. Clicking on globes moves through the premises, counter-premises, related arguments, and evidence. The map can be switched to a more traditional tree outline view.
Argument maps chart informal arguments so that the premises, objections, rebuttals, and evidence are clearly connected visually. In this way, argument maps can be developed collaboratively and developed over time. They take a little getting used to, but the Debategraph interface guides contributers pretty well.
The current front page debate is the crisis in Gaza, but that debate is connected to a set of other related debates that are worth exploring.
It might be a more formal tool than many of us are used to – and a more structured way of developing an argument than we’re used to – but it’s a way the ruling powers, consultants, think tanks, and other groups work out their thinking.