Waterboarding works... if you do it incessantly. The magic number for Khalid Shaikh Mohammed was 183 (Abu Zubaydah was waterboarded on 83 occassions). That's how many times he was waterboarded while in CIA custody. This information is supposed to be classified and redacted from the DoJ memos released last week, but apparently some of the copies didn't redact this information. When former CIA Direictor Michael Hayden was asked about this news he refused to answer saying that the info was still classified. Ummmm... don't think it is buddy. Pretty sure the cat's out of the bag.
I'm gonna go ahead and say that if you tickled me 183 times I would eventually crack and say anything to get you to stop whether it was true or not. This guy was made to feel like he was actually drowning 183 times. I think this supports the idea that torture is not an effective way to elicit information.