I write blogposts occasionally, primarily for my course on wars at Harvard's Economics Department:

Here are some blogs related to the topics I work on and teach about:

Development and Institutions:

Why Nations Fail

Chris Blattman's Blog

Applied Political Science:

The Washington Post's Monkey Cage Blog

Political Violence at a Glance

Foreign Policy and International Relations:

Stephen Walt's Foreign Policy Blog

The Duck of Minerva

Applied Game Theory:

Cheap Talk

And Everything Interesting:

Andrew Sullivan's Dish

Marginal Revolution