My work seems to be self-generating so I never have "nothing to do", even when it's quiet. When it is quiet I have my database to clean up and add new features to that my personnel are waiting for or I'll just start some of my rainy day activities when new claims against our facility come in and I start all that paperwork. Like I said, mine is a self-generating workload, it multiplies all by itself. Since I've moved out of traditional secretarial work my workload seems to reproduce like rabbits.
What I used to do is another poster has said... I organize bossie's office, or anyone else I support, so that we all can find important information quickly. My folks have come to appreciate my 5-10 minutes in their offices while they're away and thank me for the effort.
CountriGal
Deskdemon Editorial Board Member 
