Spotify updated its iOS and Google Android apps on yesterday, allowing smartphone and tablet users to access free music through Spotify's "Shuffle Play" feature. Shuffle Play allows users to listen to their playlists, their friend's playlists, or a catalog of an artist's music, but Spotify will only play those songs in a random order.
YouTube/Spotify: http://www.youtube.com/watch?v=jmDhhm3lji8
YouTube/CNET: http://www.youtube.com/watch?v=CffmuMEaYrA