First there was Red Mango--or was it Pinkberry? Regardless, ever since those two rock stars of the fro-yo market burst into song, everyone's wanted to sing along to their tune. New stores produce their own renditions of the Red Mango/Pinkberry-style yogurt, with more flavors and toppings while still boasting yogurt's natural health benefits and flavorful taste.

This store, however, offers something new: self-serve fro-yo. For 30 cents an ounce, California-based Yogurtland allows its customers to dispense the flavor or combination of flavors they want directly into a paper cup and scoop the toppings they want atop their mountain of tart and/or sweet frozen yogurt. The long lines show that business is booming and the chain plans to open new stores in San Diego, Honolulu, Las Vegas, and Dallas throughout the year.

And just as quickly as the frozen yogurt trend has grown, Yogurtland's self-serve business strategy has also spread. Yogurtopia and Tutti Frutti Yogurt have adopted a similar "freedom of choice" approach with customers. Tutti Frutti Yogurt has locations in Texas, Georgia, California, and Washington State, while Yogurtopia plans to open its second California location this fall.--Whitney Chen