It's All Too Much: An Easy Plan for Living a Richer Life with Less Stuff by Peter Walsh
I listened to this audio book just in time for spring cleaning!
Walsh's premise is that you need to figure out what kind of life you want to live, and then clear up your house so that you're able to live that life.
He goes room by room and offers hints about how to organize and how to sort through things. I liked that he confronts typical excuses for holding onto items and suggests different ways to approach the excuses.
An easy-to-listen audio book and quite helpful if you're looking to de-clutter.