Number 17

How could I forget? SM101 by Jay Wiseman. It's been around for awhile, and while some folks probably aren't too big on it, it's a pretty safe bet as far as introductory BDSM books go. The book really covers all the bases, and is quite informative. His writing style is quite easy to get in to, and the book's is actually pretty funny. And Wiseman, a former EMT and med student, has a real focus on safety, which I think is important in a book essentially written for newcomers to the scene.