Like Matt, I, too, keep all my negatives in PrintFile archival pages. My 35mm and 120 format work are each kept in a series of binders, chronologically, by location. I have, for example, a 35mm binder full of negatives of Vancouver (the city proper, and the GVRD as a whole), one of work shot on the Island (festivals, cityscapes, etc), one of work shot in New Orleans, one for Atlanta, one for the rural South, etc; for 120, I have binders for Louisiana architecture, the Canadian Rockies, Vancouver Island landscapes/nature (black and white and E6), the GVRD, etc. Currently, I have, at last count, 12 binders full of negatives. My 35mm Kodachrome and Ektachrome slides are kept in several dozen Archival Methods storage boxes as well as Logan metal boxes.