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.)
Remove iTunes tracks disassociated from files
Apply selected CD's CD Text to its disc and track tags
Create text file listing tracks common to and exclusive to two playlists
Change case of selected track names to sentence caps
Convert Roman numerals in selected tracks' name to upper case
Export album artwork as folder.jpg to Album folder