Resort City In The Sunbelt - an expose about the Las Vegas water district and other boring municipal subjects. If you make it past the first few chapters either you are a complete bore or are a county planner who's never held the dice in your life. Granted, we don't mean to be mean, Resort City In The Sunbelt is informative if you're interested in the subject matter, and it's finely researched, but if you're looking for a book about Vegas, Baby... you can skip this one even if its the last one on your local bookstores shelf.
Dishonorable Mention: All of John Patrick's Slot Strategy guides. Really now... slot strategy?