There is a database that I found called Smoke Monster's Database, it's actually a bunch of "databases" (files, not actually databases) that you load into a program and point it at a directory and it categorizes, organizes, and renamed everything for you.

A lot of ROM packs that are out there are pretty old considering the systems that they're for are decades old and have been passed around and added to for years. The packs are usually in a flat file structure and there are usually multiple files for the same game (version updates from the manufacturer) so it gets annoying pretty quickly. Do you want to have to scroll through 9000 NES games just to get to the Zelda: A Link to the Past?