Chris Randall on the limits of skuemorphism:

My opinion on the matter is that when you are first presented with a piece of software, if that software’s user interface follows some real-world gear, you concentrate on the things it can’t do, or the reasons it doesn’t sound like the “real thing.” If, on the other hand, it is unique to the software, you spend your time figuring out what it can do, while you learn how to use it.