ComputerWorld - Every story is ultimately one of conflict. Whereas inner turmoil makes for great operas, in video games, it's whoever has the biggest guns and the evilest laugh. Be it space marauders, wicked warlords or ancient zombies, these villains are known for their insurmountable tenacity, undying determination and megalomaniac personalities. Yet some scoundrels leave more of an impression than others. We've all butted heads with some digital disputant who's driven us to sweaty palms and gritted teeth. Who are your personal nemeses?