There's also the Hauppauge MediaMVP that Cringley was talking about the other day.

As a side note, it allegedly runs linux, and with an ethernet port and tv-out, for $99 it looks like it could be a real contender for hacking into a remote LCD display for the empeg. I haven't seen one in the flesh yet, and online details are lacking, but since it uses a brick transformer it should be fairly low power and suitable for car use.