And yet today, you can't click your way three links through the econoblogosphere without stumbling into a flame war between reenergized triumphalist Keynesian supporters of government intervention in the economy and bewildered, angry market fundamentalists who have just watched their painstakingly constructed world crumble around them. Just a few years ago the heat of the debate would have been unthinkable -- Keynes seemed to have about as much relevance to current economic policymaking as Winston Churchill does for the Middle East peace process.