This script will change the file type of the selected AAC tracks--which you have previously made bookmarkable yourself with the script Make Bookmarkable--to "M4A" and file extensions to ".m4a" making them UN-bookmarkable. When used with iTunes 7 or later, each track is deleted and re-added so that it will be removed from the Audiobooks Library. Ratings, play count, last played date, skip count, and skipped date are preserved.
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Change the iTunes "done" chime to a System sound, no sound, or your choice of an AIFF sound file
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Locates pairs of track entries pointing to the same file
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Search for lyric sites with Google using info from the current or selected track
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Make a text file listing Albums that have some/no tracks with artwork