Now that the book is at the printers, and up on Amazon.com for orders, you should have a target audience to which various chapters may be of interest. For example, in a book on racing pigeon nutrition, the chapter on the sport of pigeon racing could go to Sports Illustrated. The chapter on nutrition could go to the trade magazine Veterinarians Today, a chapter on the ancient communication system of carrier pigeons could be submitted to Wired magazine, and recipes for Squab au Vin could be sent to Martha Stewart Living. By sending the chapters out with a requirement that the book be cited, you pick up exposure and promotion.