How do you keep your paper sorted?

Since I'm still working on adding items to my crafting room, I always like to see how people have their's organized.  I just recently got a metal paper sorting shelf.  When I put it up at home, I decided to only keep one set of the paper shelves in it so I had the other part for storage.  I did of couse keep the other self incase my paper buying gets a little out of hand.  lol.  Comment and let me know how you store yours...