It would be really fantastic if you setup an automated cover image export feature:
For DVDPedia, where a VIDEO_TS folder has been linked, export the DVD cover to Preview.jpg to the DVD folder (the one containing the VIDEO_TS). The Preview.jpg allows Leopard's Front Row to display the cover art.
For CDPedia, possibly an Apple script, that will add missing CD covers to iTunes. For massive extra credit: Advanced:Get Album Artwork in iTunes will create a file containing a list of all the missing (unavailable from the iTunes Store) artwork -- create an automated feature that will add all available in CDPedia artwork to iTunes based on that list.
Thank you,
Ted