Sonos Controller for iPhone
Sonos systems use wireless mesh networking to communicate with each other--you can set up speakers all over the house, replicating music from a single system called a ZonePlayer. Combined with a wireless remote control with integrated color LCD screen and software you can install on a Mac or PC (or music stored on a Network Attached Storage system), you can play your digital music in any room you'd like.
In conjunction with the release of the iPhone software, Sonos has updated the system software on its ZoneControllers to version 2.7. The new release sports new features such as the ability to stream audio from Internet radio services including Last.FM and Pandora. The system already provided access to subscription-based music services including Napster, Rhapsody and Sirius. A new radio guide lets you listen to more than 15,000 free Internet-based radio shows, including music and talk, local and international stations.
Note: This link takes you to the vendor's site. From there, you can follow the link to the iTunes App Store, where you can download the latest version of the software.