Fallows has a must-read on the OPR report:
The report is available as a 10MB, 289-page PDF download here. Seriously, this is a document that informed Americans should be familiar with, as a basis for any future discussion about the costs and consequences of a "global war on terror" and about the maintenance of American "values" in the world.
Through American history, there have been episodes of brutality and abuse that, in hindsight, span a very wide range of moral acceptability. There is no way to "understand" lynchings that makes them other than abominations. But -- to use the extreme case -- America's use of the atomic bomb in Hiroshima and Nagasaki will always be the subject of first-order moral debate, about whether any "larger good" (forcing an end to the war) could justify the immediate suffering, the decades-long aftereffects, and the crossing of the "first use" frontier that this decision represented.
My point now is not to go through the A-bomb debate. It is to say that anyone who is serious in endorsing the A-bomb decision has to have fully faced the consequences. This is why John Hersey's Hiroshima was requisite basic knowledge for anyone arguing for or against the use of the bomb. The OPR report is essentially this era's Hiroshima. As Hersey's book does, it makes us confront what was done in our name -- "our" meaning the citizens of the United States.
If you want to argue that "whatever" happened in the "war on terror" was necessary because of the magnitude and novelty of the threat, then you had better be willing to face what the "whatever" entailed. Which is what this report brings out. And if you believe -- as I do, and have argued through the years -- that what happened included excessive, abusive, lawless, immoral, and self-defeating acts done wrongly in the name of American "security," then this is a basic text as well.
To conclude the logical sequence, if not to resolve this issue (which will be debated past the time any of us are around), you should then read the recent memo by David Margolis, of the Justice Department, overruling the OPR's recommendation that Yoo and Bybee should be punished further. It is available as a 69-page PDF here. Margolis is a widely-esteemed voice of probity and professional excellence inside the Department. What is most striking to me as a lay reader is how much of his argument rests not on strictly legal judgments but rather on a historical/political assertion.