I don't know if this is something that can be added to newer coaches, but Crestron just announced the ability to control an iPod from their panels.



"The CEN-IDOC from Crestron provides an interface to the popular Apple iPod personal music player, enabling full 2-way touchpanel control and navigation. Just plug the iPod into the docking station (CEN-IDOC-DS included) and replicate the iPod experience on a Crestron touchpanel, instantly sharing your entire personal music collection with speakers throughout the house. Select tunes by genre, artist, album and track right on the touchpanel."