Greg Mankiw's Blog: Random Observations for Students of Economics: Makiew uses this to keep in contact with his introductory economics students.
The Becker-Posner Blog: More of a macroeconomic focus as of late.
Freakanomics Blog: Popular behavioral economics blog
Predictably Irrational: Another behavioral economics blog with more of an experimental focus.
Robert Riech's Blog: Former Labor Secretary and labor economist
Grasping Reality with Both Hands: Brad DeLong's blog. Very good on current macroeconomic issues
The Conscience of a Liberal: Paul Krugman's blog
Economist's View: Mark Toma of U of O.
The Oregon Economics Blog: This is Patrick Emerson, a Portlander, also at U of O. Plenty of economics and occasional beer reviews.
Other blogs may be found here