This script will re-embed artwork downloaded from the iTunes Store into the files of the selected tracks.
Also see Re-Embed Artwork.
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.
Note: (August 2014) Not sure what the issue is but results are inconsistent with modern versions of iTunes.
(Note: In order to launch this PowerPC-era script on an Intel machine, it must first be opened and then saved using AppleScript Editor, which is located in your /Applications/Utilities/ folder. More information is here.)
Edit a selection of iTunes tracks' tags "old-school"
Update subscriptions which have expired by virtue of being ignored for five or more days
Displays files in iTunes Media folder not in iTunes track library
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
Display, create text file listing info of dead tracks
Copy number prefix in Song Name of selected tracks to their track number tag