Steve McIntyre is back blogging and writes (links mine):

I had also spent some time considering a response to Mann’s book. It amazes me that a reputable scientific community would take this sort of diatribe seriously. Mann’s world is populated by demons and bogey-men. People like Anthony Watts, Jeff Id, Lucia, Andrew Montford and myself are believed to be instruments of a massive fossil fuel disinformation campaign and our readers are said to be “ground troops” of disinformation. The book is an extended ad hominem attack, culminating in salivation in the trumped up plagiarism campaign against Wegman, arising out of copying of trivial “boilerplate” by students (not Wegman himself). Wegman’s name appears nearly 200 times in the book (more, I think, than anyone else’s).

Virtually nothing in its discussion of our criticism can be taken at face value. Mann begins his account by re-cycling his original outright lie that we had asked him for an “excel spreadsheet”. Mann’s lies on this point had been a controversy back in November 2003. The incident was revived by the Penn State Investigation Committee, which had (anomalously on this point) asked Mann about an actual incident. Instead of “forgetting”, as any prudent person would have done, Mann brazenly repeated his earlier lie to the Penn State Investigation Committee. Needless to say, the “Investigation” Committee didn’t actually investigate the lie by crosschecking evidence, but accepted Mann’s testimony as ending the matter. In the book, instead of leaving well enough alone, Mann once again re-iterated the lie.