This script will export then re-import the artwork data of the selected tracks.
NOTE: this script cannot handle processing more than about an album's worth of tracks per launch due to the way iTunes manages the graphics data.
For OS X 10.6 and better only.
Note: (August 2014) Not sure what the issue is but results are inconsistent with modern versions of iTunes.
Copy multiple playlists from iTunes to iPod
Exports and then re-imports selected tracks' artwork
Export Playlist names of selected Source to text file
Sort purchased tracks into discrete playlists by name or account ID
Set the Plays of selected tracks.
Change the settings of hidden iTunes preferences