There's a video demonstration of waterboarding here.
This is the most objective demonstration I could find on the web. There are a lot of over-acted extreme nonsense versions of the same idea. This one, clearly tries to convince us that waterboarding is torture. It fails to convince me.
There is much talk of the Geneva Convention when discussing how to extract information from people who want to kill us. Those who would fly jumbo jets into skyscrapers are not bound by the Geneva Convention.
The previous administration claims their interrogation techniques were successful in foiling other plots to kill Americans. Cheney has called for the CIA to release documents that would prove it. The Obama Administration doesn't seem interested in that, they seem to want to cherry pick memos that suggest illegal behavior.
It is politics. It is a waste of time. And the administration has clearly said they will adopt different interrogation techniques. Fine. Move on.
It is clear that terrorists are a different enemy than we've fought before. Perhaps different rules are required.