OS X 10.8 and later. This script will export then re-import the artwork data of the selected tracks.
Note: This script may not be able to handle processing more than about an album's worth of tracks per launch due to the way iTunes manages graphics data.
Also Note: (August 2014) Not sure what the issue is but results may be inconsistent with modern versions of iTunes.
Applet assists with swapping, copying, appending data between track tags
Capitalize the first letter of each word in selected track names
Remove iTunes tracks disassociated from files
Juxtapose text in Artist tag such that "Ellington, Duke" becomes "Duke Ellington"
Display, create text file listing info of dead tracks
Displays files in iTunes Media folder not in iTunes track library