I would like to suggest that Apple make something like “Complete My Album” and “Upgrade to iTunes Plus” available for movies, TV shows and music videos. Such iTunes features could revolutionize how people electronically rent or buy video content.
There are occasional iTunes sales and promotions that do some of what I want to suggest (and hopefully I haven’t missed any important perpetual promotions or features). I’m convinced that iTunes Store could use the upsell “complete my this or that” strategy to further leap ahead of competing digital download services. Of course, content copyright holders and distributors would have to be willing parties to the changes.