My friend stumbled across this useful register where you can log your C5's VIN against your name, location & vehicle condition.
Would have been useful to me personally when I had one of my C5's 'stolen' recently, and think that it's a great idea to have something showing your C5 VIN next to your name. May even assist in the event of a claim with an insurance company. Would be even better if it had a box for date of purchase, and an accessories section which listed things like wing mirrors, indicators, horn etc that were fitted to it.
Anyway, I recognise a few C5Alive members names on there, but not many - I'll be putting mine on there over the next couple of days. I've just got to go out to the garage in the rain and get the numbers!
The register can be found under: "C5 Directory" here:
http://www.sinclairc5.com/