Organize your (illegal) collection :)

Hi, I think most of the people will have a nice collection with (illegal) software for use with their msx or emulators. And I was wondering how do you organize your collection ? I have the following structure: Software <country> <company> ROM Disk Hardware Cartriges <company> <device name> Computers <company> <device name> Devices <company> <device name> Pictures <country> Booklets Books Flyers Magazines Manuals Covers Other So how do you organize it ?