I can tell that Glenn Greenwald's new book, A Tragic Legacy: How a Good vs. Evil Mentality Destroyed the Bush Presidency, is good without even opening it.
First, it has his name on the cover, and his blog is great.
Second, it has a big blurb from my brother on the back: “Glenn Greenwald has emerged as one of the nation’s most incisive and articulate exponents of the critique of the Bush Administration. In admirably clear prose and with the ferocity of a former litigator, he is day in and day out building a powerful case against an undeniably consequential and radical presidency.”
But if you must look inside, there's a an excerpt online.