I do what Bronikon does! I have big ringbinder, I have contact sheets in one "sleve" then the negs behind it, then another contact sheet, and more negs behind it etc... i just store them by Date (or, during my A-Levels- by "course unit")-AKA subject matter.
actually, thinking about it, I find storing pics on a PC harder than negatives! Im just buried under images with no idea how to sort them!