i love spotify and use it across several devices. iphone, ipad, notebook, windows desktop at home, linux desktop at work.
what i would really love to see is the possibility to stream radio stations (alternative, punk, artist radio) on a mobile device. often the limited possibilities get in the way of being able to just listen to some music and not having to care about what sone or artist to listen to next.
despite the radio streaming possibility, please have a better integration for ipads. it such a great device. imagine what you could do on a couch at home or in bed. stumbling through different music genres, giving new stuff a try and read the lyrics via some in-spotify-app.