OS X 10.8 or later only. This script will export the artwork of the selected tracks (or the tracks in a selected playlist) as an image file to the folder which contains each selected track's file--presumably the track's Album folder--or a single user-selected folder. If multiple album tracks are selected, the script will make sure only one artwork file per Album is exported.
Also see Save Album Art as folder.jpg.
This Preferences pane for the script remembers your settings between uses.
Paste non-ID3 Tag track and file related info into Category, Comments, or Description tag
Edit a selection of iTunes tracks' tags "old-school"
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
Re-populate selected Smart Playlists
Export files of tracks in two or more playlists to single folder
Set the Plays of selected tracks.