Why would you be worried about uSoft not supporting the O/S anymore? The web is usually a better place to find O/S support than the OE site ... there's times I still build systems with WIN98 ... NBD.
I'm all for XP ... it's lighter, not as secure (Why would you need high security for a carpc???) and the Media Center Theme that's available for it makes it look really nice. Plus, if you have a good frontend like Centrafuse, Roadrunner, Streetdeck, etc. those programs will handle your media functions. Why worry about whether the O/S can do it???
With Vista disappearing faster than it came out (uSoft said Vista will be gone in less than 2 years) ... why bother moving over to it? It's not the media hyping up saying it's bad ... it's the manufacturer of the O/S saying it ...

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perk03z06
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Windows XP PC
InTruckPC
P4 3.0 GHz Hyperthread CPU, 1Gb RAM, 120 Gb Hard Drive, DVD/CD-RW, Centrafuse XLE 1.47, 7" Xenarc, GPS, EV-DO via Samsung i730 ... more coming!