It is only October but there is no doubt in my mind that there will be no other application that beats Spotify for me this year. Currently this is limited beta release and only in certain countries. If you want it in a nutshell it is iTunes for free (streaming not download) and what Last FM should have achieved all along.
General
It does require a small download for the app but this is an easy choice and almost makes the experience easier to enjoy separating app from web browser. It does insert audio and image ads but these are hardly noticed and past quickly without annoyance. The image ads I don't ever see as I leave it running in the background. The interface is a simply shades of grey but is slick.
Features