Orange County isn't immune to the frozen-yogurt craze sparked by LA's Pinkberry. And this is even before Pinkberry has had a chance to open a single outlet here. With lines akin to geeky movie premieres, Yogurtland is fast becoming Orange County's own fro-yo phenom. There is the original store in Fullerton, but the action is centered on the new Irvine location?a space so Sanrio cute it'll make your teeth rot even before you eat. Yogurts and toppings are self-dispensed and priced by weight. In this veritable dessert buffet, 16 yogurt flavors, fresh-fruit toppings and even cereal are available. Never mind that the dessert is nonfat and has less than 30 calories per ounce?it's just plain fun to create your own masterpieces.