Sterilite Corp. ClearView 3-Drawer Organizer
These drawer sets are the perfect size for holding papers. I designate a drawer for each class, then one for papers that need to be filed, papers related to coaching, and all the papers we receive during meetings/in mailboxes/etc so that they're easily accessible (and easily located!). I used to use stacking trays, but these look sooooo much nicer. Throughout the week I throw my papers in which ever drawer they belong. Then I go through them once a week, file what needs to be filed, toss what needs to be tossed, sign what needs to be signed, and put all graded student work back in the student binders. I absolutely love them! They're also perfect for sorting colored paper:
Again, looks much nicer than trays, and very easy to manage!