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> *A wiki-powered site where vehicle registration plates are the subdomains, for example, HY10AGV.carwiki.whatever.

Make sure the subdomains explicitly include the country somewhere too—HY10AGV.us.carwiki.whatever.

At least for the US, you'd need a state separator as well, since otherwise you will have collisions. Or is that the point?

Are identical plates duplicated across states - if so, then yep, a state too! (us-ca, us-ny, etc would work)

This is a solid idea. An open version of Carfax/AutoCheck. And kind of like the way that Redfin keeps track of historical pricing information on real estate. Platewire is somewhat related (http://platewire.com/), but focuses on the driver instead of the vehicle.

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