how about palm vnc?
I know I might be 'jacking this thread a bit, but I think I managed to give the wrong end of the stick with "The CarPC runs X and a media player and sends the video output to a PDA via an ad-hoc wireless LAN in the car".
I am still just playing about with software, testing ideas etc. for my CarPC, but what I am planning is simply a laptop based MP3 jukebox, no movie playback, no sat nav, no DVD. It's all about the music, about 200gigs worth (you don't want to know how I plan to get that much storage into a laptop).
VNC and X-Windows, when configured correctly, can send just an application to a remote screen (the PDA) from the "server" (the laptop). So I was thinking that I could use Amarok or XMMS etc. as my music player. It runs on the laptop, and when music is played it's read from the laptop's HDD and played out of the laptop's audio out, but the application itself is displayed on a PDA. And just the application, not the whole desktop.
I know VNC can be slow, but what I was thinking shouldn't be too demanding (I hope!).
Yep - it's a nice workable idea... Could be made to work on the palm pretty well; relatively easy to size everything so that it is workable even on the limited palm screens... But for now the coding is beyond my capabilities...