Just curious, what happens to a person's MtGox account if their yubikey is lost/stolen/broken/etc? I'm assuming they would have to contact MtGox support and prove ownership of the account or something? Has anyone had this happen?
If they've verified with MtGox in the past, if I remember correctly, they'll have to go through the same process to reclaim the account. That and/or they have to buy another Yubikey and have it sent to the same address as the last one. Either way, it's apparently a pain. (not that that is a bad thing)