I love reading books about games. Stefan Fatsis' Word Freak remains a favorite, as do books such as Bruce Whitehill's Games: American Boxed Games and Their Makers 1822-1992 with Values (written for collectors) and Klutz Press's The Book of Classic Board Games (which includes boards to play the featured games.
But I haven't read many books on the topic of designing games. After reading Joe Huber's review of Game Design: How to Create Video and Tabletop Games, Start to Finish by Lewis Pulsipher, I expect that will change. Huber -- himself a published designer (Starship Merchants, Scream Machine, Burger Joint) -- says the book "does an excellent job of providing a path to become an effective game designer."
Pulsipher's book does emphasize videogames over board games and card games; nonetheless, Huber says he "would recommend this book to any aspiring game designer, or to established game designers looking for some new insights."