Which inventory system are you using to keep track of your equipment and negative files - Exel, FileMaker Pro...?
Things are getting out of hand, especially on the negative files front...
Just a simple log book (MS Works database) in which I record the date, film, camera, lens, subject, and processing if B&W. I number the films according to month, date, and sequence number for the month. The first roll I shoot this month will be #1008-1.
I file the negatives in PrintFile sheets, with the corresponding contact sheet behind them, in an archival 3-ring box from Light Impressions.
I also keep another log book of "fine art" prints that I have made from each negative, so I can track the printing and sales records for each one. I don't do that for commercial clients' prints.