Did you just buy Diablo 3 and think you would jump right in to the full game? Too bad! Blizzard has decided that everyone who purchases the game will be limited to the 'Starter Edition' for 72 hours. That means new players cannot go past Act I, they cannot progress past level 13, and there is no access to the Auction House (real money or gold).
Thanks Blizzard. I was on the fence about getting Diablo 3 and you've made my decision to pass that much easier.