I just came across this (what I think is) impressive visualisation of some of the claims and counter-claims made by climate skeptics and scientists. The author (not an expert on climate science) approached this project from the perspective of someone just beginning to learn about climate chnage. He makes an important point at the bottom of the post: that even on (for example) realclimate.org, specific rebuttals to skeptics' claims can be buried in jargon, at the end of long chains of comments. Because of this issue, I think projects like this one are really important.
(I'm sure there are many other such things out there - please link to them in the comments!)