What jumps out at me from Clarke's memo is his resisting the new administration's plan to review the threats to the US on a region by region basis. Clarke points out that this very template will be the cause of Al Quaida slipping through the cracks.
The reason this pops out at me is that it is indicative of the Bush administration's approach to its entire rule: they have a template for analysis, and we will make everything conform to that template, experts and evidence be damned. In their minds, it is how strong leadership is implemented, and to them (and me), the American people want just one thing from GWB: strong leadership. Policy and results be damned.
If you look carefully, you'll see this same approach over and over again. It is a way of being out in front of issues, rather than responding to them, which in Bush land is the weakest form of leadership -- and sadly for us, the Democrats specialty.
Bush & Co. figured out a while back that the public wants a government that seems to know what it's doing. When all we can do is react to unfolding events, they are setting a positive agenda. Until we start to do the same (but obviously in the name of good, not evil), we will remain in the opposition.