The Year of Living Biblically: One Man's Humble Quest to Follow the Bible as Literally as Possible by A.J. Jacobs
I loved this book. It's light-hearted (but not frivolous), easy to read, thoughtful, hilarious, entertaining. A.J. Jacobs, a secular Jew (he describes himself as Jewish like the Olive Garden is Italian), decides to live all the rules, laws and advice of the Bible for one year, even the most obscure and bizarre. Along the way he finds other groups and individuals who try to follow those laws, and he's always respectful and fair-minded. Like Jon said when he finished it, it wasn't long enough, which is a pretty good gripe to have about a book. Highly recommended.