There was some very interesting news today about Spotify and iOS/mobile devices. Spotify is now offering, for all subscriptions levels (including free), an Internet Radio Service similar to that of Pandora. I downloaded (updated) this today and it works very smooth and should be very familiar to anyone already using the Pandora mobile app. This will be a welcome addition to just about everyone that utilizes Spotify.
You may find the iOS Spotify app and related information here:
Below is an image taken from my iPhone; it was taken while listening to the “radio” portion of Spotify and listening to the “Soul” playlist: