ArtworkGofer

This easy to use application allows to find missing artworks for your iTunes albums and e-book and add them to the albums tracks and to the e-books.

You can get artwork for selected music tracks or e-books, or you can simply find all the missing artwork for your entire iTunes library.
To search artwork for selected tracks or e-boks, select any number of tracks or e-books in iTunes, then select the Search Artwork menu command in the iTunes Scripts menu.