Stuart Staniford over at The Oil Drum has started a fantastic series of articles on The Carbon Economy. There are two thus far: Article one: The Carbon Economy and Article two: How fast should you boil a frog?.
These in-depth articles are well worth the time and mental effort. Each is followed by a lengthy comment-discussion. I am consistently impressed by the quality and quantity of articles at the Oil Drum... as well as the community of folks that participate in the discussion of each article. If you are interested in peak oil and climate change (you are, aren't you???) you should check The Oil Drum regularly.