"You've got to embrace digital technology and realize that paper is your enemy. It's 2013. There's an infinite supply of data storage available; more than any number of file cabinets you could ever cram into your office. And, even better, searches are now done as quickly as you can type. So, the best tools you need today are a good scanner and a good shredder.
Get into the habit of scanning anything you think you might need later; store it in the cloud; and, then, shred it. Not only will that keep the paper off your desk, you'll also be able to access it anywhere you go. And, by the way, yes, of course, you should keep originals which are signed (but these days most other paperwork should be tossed after scanned)."