Who's playing fb apps in here? Hehe, found a new game, its made by Pixelates Games, the maker of Castle Age.
It's a flash-based mmorpg. The game is in open beta though they say that players can still experience some bugs. This game can also be played in their website if you don't want fb,
..but they strongly recommend to play it on facebook because of some extra features like gifts and fellowships.