Small footprint device to stay in the front seat with me and simply have an output that would go to RCA A/V jacks. I could just connect a cord to the RCA inputs in the back and play the movie from ...

The Micro II ditches the input, but adds S/PDIF digital optical output (via adapter) so you can get proper 5.1 out of your laptop. Both devices are said to be available soon for a very reasonable ...