Stuff by Randy O. Frost and Gail Steketee (2010)

Subtitled Compulsive Hoarding and the Meaning of Things, this is a fascinating look not just at the world of compulsive hoarding, but at the basic attachments we have to our stuff. Explores the research into the roots of hoarding, including OCD and other obsession disorders. Includes case studies and the (sadly, often ineffective) treatments for hoarders. If you've ever watched television shows on hoarding with mouth agape, or looked with a critical eye at your storage shelves, this is the book for you.