Pour salt into a shallow dish large enough to fit the rim of the glasses you are using. Using 1 lime wedge for each glass, rub each rim. Dip rim in the plate of salt, and rotate gently to coat evenly. Place a lime wedge on each salted glass, and set aside.
Fill a cocktail shaker halfway with ice cubes. Place tequila, Triple sec, lime juice, blue curacao, and sugar in shaker, and shake vigorously for 30 seconds. Fill prepared glasses with ice cubes. Strain the margarita into the glasses, and serve immediately.