There are several files in your iTunes folder, all of which are used by various iTunes and system functions to access your music. For a standard installation of iTunes 8, there should be about six or seven items in your iTunes folder. In alphabetical order they are "Album Artwork" (folder), iTunes Library, iTunes Library Extras.itdb, iTunes Library Genius.itdb, "iTunes Music" (folder), iTunes Music Library.xml, and if you have upgraded from previous versions of iTunes you'll have a "Previous iTunes Libraries" folder.
