Zynga Prepares CityVille for Facebook Game Lovers

Zynga, the company that changed how people play online games through runaway hits like "FarmVille" and "Mafia Wars" and that now has more than 200 million users, hopes to fuel its continued growth with what may be its most ambitious game ever -- "CityVille." The game, which Zynga describes as a cross between "Monopoly and Main Street," is the company's first new game in six