The introduction to Christopher Lowell's You Can Do It! Small Spaces has quite a lot to say about eliminating clutter. Some samples:
I'm all for decorative storage, but by making containers attractive, it gives us an excuse to hold onto everything we have ever owned, whether we need it or not.
Look at every inch of your home and ask yourself, "Is that space there, where the file cabinet is, the one I haven't opened in two years, better used for something else?"
If certain objects in your home have ceased to have meaning for you, then they are just clutter, room dandruff that you accommodate rather than icons that inspire you.
Our homes are not there to preserve what we were; instead, they should become incubators for who we want to be.