Diablo III Real Money Auction House goes live

Blizzard has finally flipped the switch and brought the Real Money Auction House (RMAH) online for anyone playing Diablo III in the US. Other regions of the world will have to continue to wait patiently, with Asia likely to have to wait the longest due to a recent exploit being discovered that allowed item duplication.
According to the Battle.net forums, you are going to need a PayPal account and a Battle.net authenticator to take full advantage of the RMAH. But of course, these things are never as simple as they could be for gamers.
If you want to sell an item you can either transfer the amount paid for it to a PayPal account or your Battle.net Balance. It’s not enough to just have a PayPal account though, you also need to set it up for use with the RMAH. That involves setting up the Battle.net SMS Protect service before linking your Battle.net account to PayPal. And to use SMS Protect you need a cell phone with a data plan.
If you prefer to keep the funds as part of your Battle.net Balance, then you need to either attach a Battle.net Authenticator or use the Battle.net Mobile Authenticator app. If you don’t have either you will be prompted to buy the Authenticator, or setup the mobile version before you can proceed.
It may seem like an overly-cautious process, but Blizzard is dealing with real money here and wants to ensure gamers are protected. The good news is you only have to do it once per account, after which it should just work the every time you sell an in-game item.