Sirius XM today began shipping its promised XM SkyDock. The cradle gives any iPhone or iPod touch a satellite radio tuner that plays all of XM's channels, including the Best of Sirius package and others normally kept out of the Internet streams. A companion XM SkyDock app (free, App Store) ties directly into the tuner and provides both the main interface as well as support for iTunes song tagging.

The dock charges the device through the car's 12V port and uses the existing antenna setup from a car to get its reception, simplifying the install. An aux-in jack is built-in for a wired connection.

Sirius XM says the dock should be available in retail shops and online through areas such as the Apple Store for an official price point of $120.