Update: I just talked to Mark and it looks like he'll be posting a statement later tonight about what has happened. For all those who had thought there could possibly be something sinister involved it was actually nothing more than a hardware failure.
Yes MCO is down. It appears to be a Database issue and nothing serious. This however has also crippled many club sites that are tied to MCO including the Chicago MINI Motoring Club site. That being said I expect it'll eveything backup within the day.
In the meantime if you need a MINI fix and have read all the recent stories on Bridger.us/MINI check out the archives