CDCatalog is a simple little app I coded up to help me organize my growing CD-R collection. I have a lot of problems keeping track of my CDs that I burn. So a couple of years ago, I coded up a little python script that scanned the contents of disks I burned and gave me an ID for them so I could just write on the disk "Disk #22" or whatever. Then, when I later needed say "Cool file" on disk 22 I would search the DB and get the ID number, then get the disk. That application grew and grew... taking on a Cocoa UI, and a bunch of other things until you see the application before you.