The iPod wouldn't have been much of a success either if it had only been able to play iTunes downloads. The Apple TV would have done fine if it had shipped with

The iPod wouldn't have been much of a success either if it had only been able to play iTunes downloads. The Apple TV would have done fine if it had shipped with either a DVD player or the ability to play downloaded divx/xvid videos. The lesson is: support existing standards, then add your own.