I'm wanting to do a similar thing. I have a 7" in dash composite screen. Iwant to use my pda (ipaq 1910) as the main interface with the carpc (through active sinc).
I know the screen isnt ideal, But I think it will do for my requirements.
What I though of doing was setting up dual screens from the video card (composite and vga), set media car to run on the seccond screen (composite) from boot, and use some sort of program on the primary screen through VNC on the pda.
Ideally I'd like to use a dedicated application on the pda to control media car, possible?
Afew posts back someone said they woul write a flash based program..... has this happened, coz it would seam perfect.