Since I had my motorcycle stolen in Feb I was suprised there wasn't an operating site to publish stolen Vin's ect for bikes, some kind of free stolen motorcycle registry. It seems everyone I know here has had a bike stolen and there is very little in place to show a bikes history.
anyhow I just found this http://www.stolen-bike.com
if you had a bike pinched get the VIN updated, you never know you may get a call, or at least stop others buying the bike and allowing thiefs there ill gotten gains.
my Honda 1000RR vin JH2SC57034M001300 which was stolen will hopefully be having a good life somewhere.