Spacetime Games, formerly Spacetime Studios, really understands this whole portable MMO thing. They've released such wildly popular and critically acclaimed RPGs as Pocket Legends, Star Legends, and Arcane Legends. Their next game, Battle Dragons, shakes this trend up, and I'm not just talking about its name.
Battle Dragons is an online top-down strategy game where you build an army of dragons. Your army then does what massive fire-breathing reptiles do best - raze enemy structures and the forces that guard them.