Nothing, Nokia has come along way with it. It the latest (Qt 4.7.0) they are slowly getting things closer and closer to native look and feel. There are carbon

Nothing, Nokia has come along way with it. It the latest (Qt 4.7.0) they are slowly getting things closer and closer to native look and feel. There are carbon and cocoa versions for the mac. The Cocoa version obviously integrate better than the carbon version will. There are also Qt classes to integrate Qt based widgets into cocoa based containers etc. Is it perfect, not even close. Is it pretty darn good, yes.