I didn't see a registry started and I think these can be cool data points. I've had pretty good success over on xoutpost with 4.6iS and 4.8iS vehicle registries.
Just need last 7 of VIN, location and i'll add you to the registry! I'll be providing constant updates within a workbook along with a world map of where the vehicles are located.
E90 Production Numbers (estimate):
Pre-LCI: 156
LCI: 186
E92 Production Numbers (estimate):
Pre-LCI: 584
LCI: 323
E93 Production Numbers (estimate):
195
Click for Map: BMW E9x M3 Interlagos Blue Around The World
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E201089, Palladium Silver Novillo, Virginia (1 of 132 IB/Silver/DCT/E90)