Here's my tiny office early on this Monday morning. (I removed my 10,000 other mugs and glasses that were on the desk, but otherwise this is basically what it looks like most of the time.)
Everyone asks how I manage to keep the space so clean. The single handiest tool for curbing the paper clutter is this little device:
Compact-Space Color Mobile Scanner
This little gizmo is one of the best purchases I've ever made. I scan all of our financial records, medical documents, pet paperwork, cards and notes. It saves me from accumulating piles of paper around the cottage, and helps my business run more efficiently. It measures 11.5" x 2" x 1.5" inches-- basically the size of a thick ruler.
It lives on the back of my iMac via a "backpack" that I really love.
More small-space office tips can be found here on one of my older blog posts. I hope it helps!