It has been done - can't quite remeber who it was now though. Someone from Switzerland. The car has an engine prewarming system with a remote control. He has it set up to turn on the empeg using the remote, and can listen to music being streamed from the empeg over a wireless link on his PC - is using DisplayServer.

Is kinda cool

(list 6284, Mk1 S/N 00299 4GB blue [for sale]. Mk2 S/N 080000094 6GB blue)
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)