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.
Remove iTunes tracks disassociated from files
Play the selected track and stop
Perform search-and-replace on text in your choice of tags
Change case of selected track names to sentence caps
Convert selected tracks and replace them with converted versions
Export album artwork as folder.jpg to Album folder