One thing: Dawkins is a very good writer when he's not ranting against religious people (I happen to agree with him in every point on the latter, but his style sometimes grates). He did get me very interested in what he had to say about the evidence for evolution. And his little side-stories and quips are very often entertaining and amusing.
The figure of 44% of Americans believing that the world was literally created less than 10000 years ago, complete with us and dinosaurs walking side by side, etc. This I find chilling. I could understand that a lot of people would, in a country in the grip of some backward religion... wait..
I suppose there is some deep resistance in many of us to the idea that our great-grandfather so many times over was something similar to an ape, something similar to a fish or a bacteria. It is so much better to believe that God created us to his image (and sent us out to vanquish those who didn't believe in him...)
I enjoyed the book enormously.