From this New York Times article about the restaurant Sueños (311 W. 17th) comes this drink that sounds pretty tasty:

LA PALOMA Adapted from Suenos 1 1/2 ounces Herradura Hacienda del Cristero Blanco tequila 3/8 ounce fresh lime juice (half a lime) 4 ounces Mexican Squirt soda (or 1 ounce freshly squeezed grapefruit juice and 3 ounces 7Up) 1. Pour tequila over ice in a tall highball or Collins glass. 2. Add lime juice. Add Squirt or substitute. Stir and garnish with a slice of lime.