FlyTunes, the new music service for the iPhone (and iPod Touch), is set to be released on January 21st as a free download. It's a web-based service that gives you access to 20,000 music channels, which you personalize from your PC or Mac computer. The idea behind it is to provide a satellite radio experience without the need for a receiver for satellite signals. And you can access your music offline as well, by caching selected music to your device.

FlyTunes also works with all iPods, most other portable media players supporting MP3 files, as well as multimedia-enabled cell phones.