Dragons in Our Midst, by Bryan Davis, is an awesome series. The story centers mainly around a boy named Billy Bannister and a girl named Bonnie Silver. They are the son and daughter of dragons turned human. Billy has the ability to breath fire, and Bonnie has a magnificent pair of dragon wings she hides inside a large backpack. Together, along with their friends and family, Billy and Bonnie embark on several quests to fulfill thier rolls in several prophesies given by the prophet Merlin of old, and avoid being killed by the dragon slayers, who didn't stop hunting dragons when they lost their scales.

And, equally awesome is it's sister series, The Oracles of Fire.