My system is to archive negatives in sleeves.
I use Year - Month - Roll Number, like 120613 would be the 13th roll of June 2012.
Individual frames of each roll would be 120613_01, 02, 03, etc
I make a contact sheet of each roll and store it with the negatives.
I write on the sleeve how I exposed the film, how I processed it, what chemistry, agitation, time, and temperature.
Then finally I store the sleeves and contact sheets in archival binders that are dust proof, a clam-shell design with overlapping edges, which can be stacked.
This works really well for me, and I can easily go back through the files to find stuff I want. When I finish business school and have more time I'm going to scan each contact sheet and keep separately for when I want to find individual negatives.
"Often moments come looking for us". - Robert Frank
"Make good art!" - Neil Gaiman
"...the heart and mind are the true lens of the camera". - Yousuf Karsh
I just adopted a new system tht i really like. i typically have several cameras loaded and develop out of date sequence. So i store the neg strips in sleeves noting date range and camera body in binder like i always have. But, when i cut individual images off role for enlargement, i now store them in 2 1/4 x 3 1/4 glassine sleeves. These sleeves and their negs slide into 4x5 neg holder sleeves (4 per page) in a separate binder or 'print log'. And what i do is note the title of the image, date taken, location, cam and lens info as well as development info on 3x5 cards i keep with me in field and in darkrooom. And these index cards slide in nicely behind the neg stored in the sleeve. I like this because i hated trying to put back 35mm and 120mm negs individually back into sleeves after enlargement and I wanted to be able to move things around easily for chronology; sliding the cards and negs around the 4x5 'pockets' as needed. Keeping my field and darkroom notes together with the neg makes it a very effective system for me and my print log of 'keepers' is much thinner than the main binder of cut rolls. This came about by accident when i picked up a packet of 4x5 instead of 120mm sleeves; glad i did. cheers!