KPlayTray is a smal system tray icon that helps you manage your collection of mp3 (or other multimida files) when it's split among multiple media.
Suppose you have your mp3 files in three directories:
/mnt/cdrom
/mnt/cdrom1
/mnt/zip
When you click on its icon a menu will popup listing all the playlists that you have configured for that directory. At present time this is done reading an XML file that contains information about playlists in that directory, but in the future direct scanning of the directory will be added.