Its been a while since I've read Krugman's work, as opposed to his op-eds ~ I'd thought I would have heard it if he had abandoned New Keynesian economics for some other approach, but I'd be happy to have the citation to a paper where he does so.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.