No one mentioned the Inheritance Saga? The series that started with Eragon. I think they're really well done.
I share the opinion that if they're really well done they're cool but the Dragon concept can be misused and may not go that well with the story. And maybe have them play a character and not just an instrument for an end. And normally Dragons have always free will, if they choose to be submissive to the mere mortal human they have some reason to do it.
Off-Topic:
Effervescent Zombies? Do you drink that?
I wouldn't mind sparkly vampires, glittering werewolves or effervescent zombies it they were in a humor story, but in a supposedly serious story? Come on! Who can take that seriously? Or at least find a good explanation for it, they may even be on crack.