Diablo III released weeks ago, Blizzard's held off from launching the game's controversial real-money auction house in North America for its own reasons. All must be good on the studio's end, however, because the auction house has gone live in the game as of today.
Unlike the traditional in-game auction house, the real-money variant deals in actual currency (such as USD). Players can sell their hard-won goods for cash, which can then be either spent on the auction house, sent to their own personal PayPal accounts, or converted to Battle.net Balance credit.
The real-money auction house requires additional setup if the players have not attached a PayPal or authenticator to the account. Blizzard does take its cut, and business must be good: There are reports of items going for over $200 already.