Recommended reading: "And He Shall Be Judged," by Robert Draper in GQ, a notably negative piece about Donald Rumsfeld. Also, "Rumsfeld: The Reckoning," by David Frum at New Majority. And note the curiously narrow nature of Rumsfeld's rebuttal to the GQ piece.
UPDATE 5-20: And note how The Corner and the Weekly Standard blog have found nothing much to say about the article, other than to rehearse Rumsfeld's rebuttal.