Thanks for the advice so far - I have a very vested interest in teaching (one of the reasons why I went to graduate school), as well as research/writing, so parting with production books is not really an option. I did recycle a few boxes of notes and old paperwork that wouldn't really mean a whole lot down the road - which was a tough decision since I am one of those stage managers that tends to write notes in random places and I keep every single scrap of paper/post it/notecard/etc. that I use throughout the course of a show. =) I also work for a lot of dance companies who tend to put pieces into their rep. I always turn over a copy of the call and other pertinent paperwork to the company, but like to hang on to my own copies as well. As an example, I worked for a company last fall that is now remounting the same show here in town and then taking it on tour to the Dominican Republic - I'm going to be working on both productions. I just pulled out the book again yesterday!
Progress so far - done a lot of cleaning out of my closets in my apartment and am planning to set up a mini "supply cabinet" of all my spare supplies (paper, notepads, binders, tape, post-its, etc.) on one shelf of the closet, and then have one complete kit with all the essentials (stapler, three hole punch, pens and pencils, post-its, personal items, etc.) that I can grab and go. I'm setting up one of those three-drawer plastic things with all the miscellaneous power strips, batteries, etc. to keep in the bottom of the closet, and then will be putting together a rubbermaid bin that is the complete "mobile office" for when I really do have to bring everything to a gig - coffee pot and filters, hot water pot, foam roller, Pilates ball (as I said - I work with lots of dance companies!), file box, etc.
I'm eliminating the drawer unit I had set up in my apartment that had miscellaneous office supplies, paper, etc. and just folding all that into the stage management supplies stuff in the above paragraph.
So that's the news so far.....keep the suggestions and ideas coming; it is great to hear how other folks organize their freelance lives!