Center for Applied Rationality – reading list recommended by CFAR.
Overcoming Bias -A blog primarily written by famous economist Robin Hanson. This guy invented prediction markets, and he has a lot of interesting things to say.
Alexander Kruel’s Link List -Alex posts about 10 links a day on a wide variety of scientific topics. I don’t know how he finds such a wide variety of novel articles, but I appreciate his efforts.
Twelve Virtues of Rationality by Eliezer Yudkowsky. This short essay does a remarkable job at synthesizing many of the components of rationality.
Marginal Revolution -one of the best economics blogs on the web.