I love closets. We have a bunch of them in the house, and I use them for putting all sorts of things I don't want to see.
The main coat closet near our home's front entrance is the stereo closet. All our stereo components and DVDs are in there. The only stereo-related things out in the family room are the TV and speakers.
In my new office, I have a walk-in closet. That has all my hard drives, peripherals, printers, extra computers, network hardware, books, magazines, boxes of cables, papers, manuals, CDs, and so on. Everything I don't need to be able to see is in there.
Adjacent to this closet is another big walk-in closet, for Jennifer to load up. This should help clean up the house considerably too.
I am more efficient when my mind is uncluttered. Organization helps keep my mind uncluttered. But keeping it not just organized, but out of sight, and hence out of mind, is even better.