UPDATED: Music Folder Files Not Added v3.0
Music Folder Files Not Added v3.0 is a Cocoa-AppleScript applet that will list the file paths of the audio and video files in your designated "iTunes Media" folder which are not in iTunes' library.
Additionally, you can select a different parent folder and its contents will be compared to the iTunes library. Includes options to Add a selection of found files to iTunes, move them to the Trash, andnew in this versionexport to a text file.
(An earlier version of this script, Music Folder Files Not Added v1.1, runs on pre-10.6 systems. Also, this script replaces the functionality available in List Music Folder Files Not Added.)