These postings are all responding to Daniel Dennett's op-ed in the New York Times. I know i'm probably way behind the curve on this, but i just discovered Technorati's Link Cosmos — it indexes links to articles, so you can get a list of all the blog postings that comment on Dennett's article, for example.
It's nothing short of amazing. It's what we wanted Xanadu (ten+ years ago) and Crit (five years ago) to do: create a forum for lively discussion and criticism of the news, to give a voice to dissenting opinions and encourage dialogue. But it's happened through the introduction of a mechanism that makes it easier for people to write, not a new link architecture or really any new interesting technology at all. It's almost entirely a social phenomenon.