The following links to the most interesting read I have had in a while:

Carbonomics (online book)

The author(s) obviously have some biases, but the information contained in the articles are sourced and the information concerning fuel economics and the world markets is facinating. I would pay careful attention to the chapter on peak oil (chapter 3). This was a breath of fresh air for me.  

More information about the author can be found here.

Also, the main page has a plethora of articles on a variety of interesting topics.