First a warning is in order. Amazon's description of this 2010 revised edition (paperback) is not accurate, as actually this edition just has one new chapter (regarding global warming affirmers), not two as announced (the seal in the cover correctly states that there is only one new chapter).
This new chapter (actually is kind of author's postscript) is short and Solomon deals quite harshly with the recent developments regarding Climategate and the recently discovered IPPC blunders in its 2007 Report. Each subject is analyzed briefly and in a very sarcastic way. For those who already read the original edition it is not worthy to expend $12 for almost the same content. If interested in Climagate, there is quite a crop of 2010 books dealing with this affair. I do recommend Climategate: The Crutape Letters (Volume 1), quite an honest and forensic analysis of the controversial e-mails, with plenty of background to understand the context.
Back to The Deniers, see my full review of the 2008 edition here (The Deniers: The World Renowned Scientists Who Stood Up Against Global Warming Hysteria, Political Persecution, and Fraud**And those who are too fearful to do so). In summary, I do not agree with all the criticism raised by Solomon, but he did manage to raise several valid and key issues. Chapter 8 presents criticism by Freeman Dyson and Antonino Zichichi, questioning the confidence and validity of climate simulation forecasts, particularly regarding the use of parametrization or "fudge factors". Also look for Hendrik Tennekes arguments regarding the lack of falsifiability from Popper's philosophical point of view.