There have been a lot of good anti-torture pieces, but I thought former columnist Anthony Lewis did an especially good job in the NYT today. I particularly liked how he pointed out that the Geneva Convention, UN Convention Against Torture, and Uniform Code Of Military Justice all prohibit inhumane and degrading treatment, not just the fingernail-pulling and genital-shocking that torture apologists consider to be the true limit of acceptable interrogation techniques.
Of course, if the US got busted using those, they would just find a way to move the goalposts even further ("At least we're not force-feeding them honey and then tying them to an anthill with a beehive in their underwear!").
Come back, Tony, we need you!