...now... is this one of ours or is it one belonging to the Khymer Rouge?...

Jonah Blank: "Bottom line: Not only do waterboarding and the other types of torture currently being debated put us in company with the most vile regimes of the past half-century; they're also designed specifically to generate a (usually false) confession, not to obtain genuinely actionable intel. This isn't a matter of sacrificing moral values to keep us safe; it's sacrificing moral values for no purpose whatsoever." via Growabrain

Here's a view of exactly what waterboarding looks like. The accompanying article is also very good.