The "People" sidebar, populated by my Facebook friends, has actually proven handy, letting me listen to entire playlists of theirs, find new tracks I like, and share them with other users.

As most iTunes users know, Genius not only puts songs of the same genre together but also recommends new songs to download by going through your personal playlists.

Just like the latest desktop client, Spotify mobile lets you send music to your Spotify and Facebook friends, as well as browsing the "top lists", based on new and popular tracks.