Yes, waterboarding worked.
Today on Meet the Press Secretary of Defense Leon Panetta admitted that information gleaned from waterboarded detainees was used to track down al-Qaida leader Osama bin Laden and kill him.
“The real story was that in order to put the puzzle of intelligence together that led us to Bin Laden, there were a lot of pieces out there that were a part of that puzzle.Yes, some of it came from some of the tactics that were used at that time, interrogation tactics that were used. But the fact is we put together most of that intelligence without having to resort to that.”
Panetta then went on to speculate that the US might have been able to kill Bin Laden without enhanced interrogation techniques.