1. World of Warcraft: Cataclysm
The 800-pound gorilla, StarCraft II, shipped this summer. Now meet its 1600-pound sibling. World of Warcraft: Cataclysm couldn't get much bigger, what with Blizzard letting a dragon-god loose to wreck the world. You can now level from 80 up to 85, explore a bunch of new areas and try your luck as either a goblin or a werewolf. Better still, if you're already a subscriber and don't care about any of that yet, you get access to all the new quests and revamped areas anyway. So kiss your Azeroth goodbye, and your offline social life too.