With my Pioneer car stereo system, I can connect my iPhone and watch Netflix or youtube video on the screen of the head unit with no explicit user interaction, other than connecting the iPhone of course. It would be really nice if the slingplayer would do the same. It does send the audio, but that is no better than just listening to the same channel on XM.
I'm surprised there are no other users requesting this feature recently. It can't be that difficult to implement.