Tyler Cowen and Alex Tabarrok's blog, Marginal Revolution, and Arnold Kling and Bryan Caplan's blog, Econlog, were both listed as top economics blogs by the Wall Street Journal:

Top of the tree is Marginal Revolution, produced by George Mason University academics Tyler Cowen and Alex Tabarrok. Cowen also writes an interesting column for the New York Times. But in terms of breadth of interest in economic subjects, literature and ephemera, Marginal Revolution is like nipping into a world-class local bar, where the drinks are always perfectly mixed, the atmosphere is relaxed and civilized, while intelligent conversation and serendipity are available on tap. The comments tend to be of unusually high quality too.

...Arnold Kling and Bryan Caplan at Econlog are also very good for a libertarian-inclined view of the economic world.