Amazon needs to buy Pandora and integrate it with the cloud player. I listen to Pandora, then buy the songs I like on Amazon so I can hear them to stop them from going off in my head.
This would be great... Although I don't mind listening to them on one site and hearing Amazon on the other ( It is not that much of a hassle) Pandora needs a better business model, and Amazon can bring the other half of my strategy..