by Madsen Pirie
The use and abuse of logic.
I heard about this book via the Merseyside Skeptics Society's excellent podcast, Skeptics with a K. The book classifies and describes the different sorts of tricks and logical fallacies people tend to use—either deliberately or inadvertently—in arguments. Pirie's thesis is that, by learning to recognise such tricks and fallacies, you greatly improve your chances at winning arguments.
Although some of the tricks and fallacies described are just plain silly, others can be rather subtle and difficult to spot. Reading this book has already helped me spot—and therefore avoid—a couple of red herrings in arguments with friends.