I haven't commented on Scott McClellan's book because nothing he says seems to be new. He's just covering his ass, as former administration hacks tend to do. As for the major focus, the lead up to the invasion of Iraq, here's some information from McClatchy, which bought Knight-Ridder a couple of years ago. You'll recall that Knight-Ridder was about the only press outlet that was questioning the war and the dog-and-pony show leading up to it.
Another reason I don't have to comment is because digby's crew has been on it: here's just a sample, from dday, tristero, and digby.