MP3 Album Organicer lets you add your large collection of MP3s to a database, not by the name of the album in the ID3 tag, but by the name of the album folder. It also adds the tracks in the album to the database, by the filename and by the artist/track from the ID3 tag. You can search for albums, artists, tracks, etc. It zips the albums on demand to allow people to download them easily. There are all kinds of statistics and some more functions.
