Free Realms, of course -- and in turn, Free Realms gets 1,000,000 registered accounts in just 18 days.
We knew that Sony Online Entertainment had stumbled upon a recipe for mind-blowing success (an in-game trading card game and kart racing? That's just fiendish), but to get a million players on board in just over two weeks is simply remarkable. We're terrified to think of how this number will skyrocket when the game lands on PS3s. Terrified, we tell you!