Get a PO box.
I use it and it works pretty well - in many ways it's better than a PO box. Actual physical address, no paper to deal with, and you don't have to drive anywhere to get your mail. The interface is a little sluggish, though (ASP & MSFT Servers...) - but they say they're working on that.
It's great if you don't want to change your address every time you move.