I was thinking a great idea would be if spotify teamed up with apple or sony or somehting to create a spotify-only device. The benefits of this could be that it would come with a free subscription to the service on that device or somehting or it could cost much cheaper if you have a premium account. Also you could have a faster, better interface with spotify than on the ipod which i think is quite slow and a bit awkward!
I don't know there could be loads of different benefits to something like this please share any ideas you might have! :)