Henry Farrell and John Sides, "Building a Political Science Public Sphere With Blogs," The Forum 8, 3 (2010: Article 10. Ungated link here, though you need to register.
We argue that political science blogs can link conversations among political scientists with broader public debates about contemporary issues. Political science blogs do this by identifying relevant research, explaining its findings, and articulating its applicability. We identify strategies besides blogging that individual scholars and the discipline could undertake to enhance its public profile.
It's good to keep discussions like this going, though my guess is that many political scientist bloggers feel rather talked out about it at this point. As always, I would add my two cents that most political scientist bloggers focus on American politics or U.S foreign policy, so as I wrote last month all examples used in arguments about blogging ignore comparative politics. So if I added anything to this article, I would encourage more comparativists--and of course more Latin Americanists--to start blogging.