Back in March 2011, Randolph Azerof, also known as The Raven, posted a comment on a Virtually Speaking episode featuring UC-Berkeley Economics Professor Brad DeLong.  Brad recently referred to that comment, and Paul Krugman picked it up. Interestingly enough, this led to a fair amount of discussion among different members of the New Classical vs New Keynsian advocates. Steve Williamson chimed in

Noah Smith rings some more changes.  (To his credit, several links in that post you should click through to. And read the updates.)

Brad's Reply.

Oh, so this is why we're rerunning, at Virtually Speaking, the original discussion