Over at Monkey Cage, Andrew Gelman has an excellent piece on how post-publication peer-review works (and doesn't) in the blogosphere. One of the central themes (to me) is how complacency can be part of the process. This, of course is not limited to the post-publication...
academic bloggers
As Rob mentioned already, I spoke at an ISA panel on blogs and the academy last week. Key questions included whether or not blogs matter for policy, to what extent.