Another report gives a clear indication that enhanced interrogation methods worked (Berman Post: Waterboarding Worked). Specifically references in this article are Waterboarding (referred to as simulated drowning) and sleep deprivation. They point out that he did give some false information, but also gave enough good information to be considered the ""preeminent source" on al-Qaeda".
The fact that it works will not matter to those who appose these techniques on moral grounds. The argument against them on the grounds that 'it does not really work' are not, and have not been for a while, genuine.
http://www.washingtonpost.com/wp-dyn/content/article/2009/08/28/AR2009082803874.html?hpid=topnews&sid=ST2009082804015 (bold mine)
"After enduring the CIA's harshest interrogation methods and spending more than a year in the agency's secret prisons, Khalid Sheik Mohammed stood before U.S. intelligence officers in a makeshift lecture hall, leading what they called "terrorist tutorials."
Speaking in English, Mohammed "seemed to relish the opportunity, sometimes for hours on end, to discuss the inner workings of al-Qaeda and the group's plans, ideology and operatives," said one of two sources who described the sessions, speaking on the condition of anonymity because much information about detainee confinement remains classified. "He'd even use a chalkboard at times."
These scenes provide previously unpublicized details about the transformation of the man known to U.S. officials as KSM from an avowed and truculent enemy of the United States into what the CIA called its "preeminent source" on al-Qaeda. This reversal occurred after Mohammed was subjected to simulated drowning and prolonged sleep deprivation, among other harsh interrogation techniques.
"What do you think changed KSM's mind?" one former senior intelligence official said this week after being asked about the effect of waterboarding. "Of course it began with that.""