Announced today they will soon be launching Spotify Platform with free Spotify Apps:

http://pansentient.com/2011/11/introducing-the-spotify-platform/

The 13 global partners launching on the Spotify App Finder include Billboard, Fuse, The Guardian, Last.fm, Moodagent, Pitchfork, Rolling Stone, Songkick, Soundrop, TuneWiki and We Are Hunted

Demo of Rolling Stone, Last.fm, Songkick, TuneWiki apps at press conference today looks great (starts around 18:54 mark)

http://www.billboard.biz/bbbiz/industry/record-labels/watch-spotify-s-new-direction-press-conference-1005581352.story

A DiS app like the Rolling Stone one would be fantastic.