Stuff : compulsive hoarding and the meaning of things / Randy O. Frost and Gail Steketee.

I am with Christa on this one; it's a fascinating book, but anxiety-provoking. While reading it I found myself scrutinizing every little stray bit of paper in my fairly messy house. The tentative explanations for what is happening in the brains of hoarders are interesting and well-written for the layperson. (Plus, ultimately, the anecdotes were so extreme that I ended up feeling pretty good about my own situation...after a couple of trips to the trash dumpster.)