The Year of Living Biblically (by A.J. Jacobs)
I really loved this book. The author's voice is funny, charming and engaging, the premise is clever, and the topic is quite thought-provoking. I'm actually thinking about teaching this in a class next semester; it would be a good choice for a non-fiction book, the students would like it, and it would provoke some interesting class discussions. Now I have to go read Ecclesiastes! Thanks, A.J.!