This script will look for an image file in the parent folder of each selected track's file--presumably its Album folder in which you have previously placed an image file of some sort--and apply the data from that image file as artwork for the track.
OS X 10.6 or later only. iTunes 10.3 or later only. Previous universal version available at the link below in the "Info" section.
Add or subtract a user-entered number from each selected track's Plays
Make a text file listing Albums that have some/no tracks with artwork
Use tag info from selected track to search Amazon Books for cover art
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
Rename selected tracks' Song Names with their filenames (minus extension)
Renumber order of selected tracks