I found that Tim Berra's Evolution and the Myth of Creationism to be an excellent book. While he does a good job at the title topic, I was ultimately most impressed by how elegantly he summarized the basic concepts of evolution and presented very clear evidences. Quick read, will get you onto the basics. It is an older book, 1992 IIRC.
One I recently read was Darwin's Dangerous Idea by Daniel C Dennett (1995). He goes at it from the philosophy of science side, and it is really heady but amazing and quite readable (although I ended up rereading major portions to insure I was following his logic correctly, not because he was unclear but because I was floored half of the time and wanted to insure I was getting what he really meant!). This book presents the ideas of other writers including Gould and Dawkins from the social/philosophical side as well as an excellent basic presentation of the general ideas and conflicts.
Doctor Bashir: "Of all the stories you told me, which were true and which weren't?"
Elim Garak: "My dear Doctor, they're all true"
Doctor Bashir: "Even the lies?"
Elim Garak: "Especially the lies"
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