Rhapsody is all set to unleash an iPhone version of their pay-to-play music service. The app — which is wending its way through the iTunes approval process as we speak — will be free to download, but you need to subscribe to the $14.99-a-month Rhapsody To Go service to use it. (Rhapsody Unlimited members will not be able to take advantage of the app.)
Assuming the House of Jobs will actually allow iPhoners to download music from someone other than them, early adapters will have to live without offline capability (i.e. caching tracks for later listening), although a rep from Real says that should be included in Version 2.0.