According to Focus Fine Art Photography magazine, Armed America by Kyle Cassidy is the #1 selling photography book in America. Cassidy traveled the country for years, asking people why they own a gun, and took lovely portraits of the gun owners. I am especially drawn to Jessica, her cat, and her reasoning. The book is available on Amazon and would make a great holiday gift. After reading the customer reviews, it seems the book has changed a few minds about gun ownership. Bravo.
(big thanks to Raven over on Livejournal, for the tip)