Scientific American has a response to the leaked CRU emails and whatever doubt they may cast upon AGW. I have to confess that I stopped reading SciAm in the early ’00’s when they changed to a new editor who seemed to sensationalize science to the point where the magazine felt like Omni without the space-alien lesbian stories. Then they did what, to my mind, was an unfair assault on Bjorn Lomborg’s The Skeptical Environmentalist. But read it and form your own thoughts.
The RealClimate website has a page of links to climate data, for those who want to see the raw (or processed) stuff.
And here’s a link to the website Skeptical Science, who sets out to debunk some of the standard AGW-skeptics’ arguments.