I read "Stuff" recently. I've been steadily shedding possessions, and am happier for it.
Books were the notable exception in your essay. They're my exception too.
Since you wrote the essay, many have switched to e-books. Did you? If you did switch, why did you?
http://www.paulgraham.com/stuff.html
With that in mind the library of books I would even want to buy electronically is limited. A further limitation of e-books is that they often come with DRM. E-books that I've seen are sequential access, paper books are random access. Search helps bridge the gap here. (Paper books will never have search, and it's arguably a more useful feature than random access. Especially if your E-reader software supports bookmarks.) The major advantage of an E-book is that it takes up basically no space. Considering the flexible media potential of electronic computers, that's sort of disappointing.