RealClimate.org

RealClimate is a blog-style website put together by several scientists who are actively study the Earth's climate system. If you're already a science geek then you can keep up with the latest misleading or just plain wrong information spewed out by editorialists. These guys are good at untangling the sometimes confusing or seemingly contradictory information that is given to the general public. Because it is a blog, there is a chance to reply to the topic and get a discussion going. A lot of the people that participate in this are also climate scientists...so you get a chance to "listen" in on the discussions they are having.

If you are new to the types of data thrown around and how the climate system works, in general, then check out the index page first. There's a lot of good info in there.