I bought it at the American Museum of Natural History in New York, which had a special exhibit on evolution and the life of Charles Darwin.
Dawkins argues his case without mincing words; he's direct and to the point. What I liked best though, was his demonstration that most of the arguments against the theory of evolution involve what he calls "Personal Incredulity", where someone attempts to disprove evolution simply because they don't believe, or can't bring themselves to believe, that it could work. Reading some of the arguments, the less philosophical among us could actually start to wonder if there's some truth in them. Dawkins, however, is quick to shred the thin logic apart and expose it to be, in fact, merely the result of a lack of understanding or simple refusal to accept the blindingly obvious.
Some further thought shows that offering up personal incredulity as an argument is all too easy. It may be as obvious as just saying "I don't believe so-and-so" or more sneaky, saying "how can so-and-so be possible?" and proceeding to quote references like "common sense". Sometimes, questions asking the "do you think so-and-so could ever happen?" are used to trick you, the reader, into accepting a point of view because if you don't, then your common sense is called into question. We'd rather believe dubious claims and beliefs than question our own common sense: egotism in it's finest form.
Follow your minds, people... egos are only meant to be neatly pressed and folded into an old suitcase.