Harvard economist and Cato Institute Senior Fellow Jeffrey Miron has a relatively new blog that is worth following. It is titled Libertarianism, from A to Z.
I first became aware of Miron in the Spring of 2005 when I attended a lecture at Wabash College. Miron was the 2004-2005 lecturer at Wabash College's annual Rogge Memorial Lecture.
The Rogge Memorial Lecture honors the late Wabash College professor Ben Rogge, a champion of libertarian principles and free market economics. (Milton Friedman's book Capitalism and Freedom is based on a series of lectures he gave at Wabash College, at the behest of Rogge, in 1954.)
Rogge also narrated the film The Incredible Bread Machine, which has an appearance by Friedman:
Miron has appeared on many news shows as well: