The original WaPo editorial:
Andrew Sullivan states that it is the application of pain and suffering, not the individual methods themselves, that defines torture.
http://andrewsullivan.theatlantic.com/the_daily_dish/2009/04/mark-thiessen-it-was-torture.html#more
Steven Benen discusses the assertion that the torture was actually helping the detainees, by helping them do their duty to Allah.
http://www.washingtonmonthly.com/archives/individual/2009_04/017846.php
Michelle Malkin notes the change in the President’s position on prosecutions, while excerpting the Thieseen op-ed.
http://michellemalkin.com/2009/04/21/another-day-another-obama-flip-flop/
4/22/09 UPDATE:
Timothy Noah asserts that Thiessen and others have the wrong chronology in using the plot to bomb the Library Tower as a justification for these techniques:
http://www.slate.com/id/2216601/
Anyone else talking? Put link in comments.