Not sure how this has been overlooked so long, but the iOS version of iTunes should support the same wish list capabilities of the desktop app. It would be great to be able to tag songs and albums as “to be purchased” or just to be remembered later. This could also have a social aspect, as friends and family could buy you music from that list on your birthday or another special occasion.

Also lacking on iOS is support for iTunes Extras and LP. These services enhance the movie and music album experience with extra content such as commentary and artwork or liner notes. The big screen of the iPad or the lean back entertainment of the Apple TV is ripe for support of these features. Another incentive to retain customers by offering the best experience across devices.

Lastly, iTunes would have a greater wow factor for customers if their content purchases would sync up to the content preview. For example, when previewing a song results in a purchase of said song, the iPod app should take over playing that purchased track seamlessly from the store.

This level of attention to detail is what customers should expect from their Apple experience.