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.
Remove iTunes tracks disassociated from files
Perform search-and-replace on text in your choice of tags
Select iPod tracks in iTunes and add them to iTunes
Sync files between a designated playlist and folder
Remove selected tracks and Trash or delete their files
Export selected playlists as individual XML or M3U files