Just thought I would share what I use as parts organizers.
They are fishing tackle organizers with removable dividers. I bought these at Bass Pro, but I am sure any sporting goods store will carry similar cases.
I find them extremely handy to assess my parts inventory at a single glance and stock up on parts that I feel I will soon be running short on. My garage can get quite dusty if I am cutting guitar necks or sanding and these cases keep all the parts clean and dust free as well. They also stack very well and make for easy storage.