Okay Thanks. I have just found that Topic also, just a moment before you posted it.
Me and my frined have just planned to make a MMORPG game. As many other. But we have searched for a good engine. (Gamesalad, Stencyl, Normal AS3, Java, Unity and many more) But i think we found the right one now. There is a good option to make many new features to the game, just with using AJAX and PHP.