Diablo III

Diablo 3's Auction House will feature two currencies, the first one will be in-game gold and the 2nd one will be real life money. Yep, you read it right, Diablo 3 will let you buy items with either gold or real life money! It's also worth noting that you will also be able to sell loot for money, and transfer that money outside the game. I guess gold farming just got interesting.