That's a very novel install. I just saw an Archos unit on sale the other day & never would have considered using it as a media hub in the car. THe nice thing is that you can carry your content with you as needed. No disks or extra players etc. Very nice concept.
Would something like this possibly work with OEM headrest screens? I assume they'd be able to work with the AV out, even though there's no drive attached, but would want to be sure before pursuing it (wait- my mod list is growing fast!)
Best,
M