Singleton vs. static class

It seems all the object-oriented design guidelines say that if you want only one instance of a class to exist at any time, you should use a singleton. My question is, what are the advantages of using a singleton over simply using a class where all the member variables and methods are static?

>>13
You've got to understand that anything pertaining to C++-style OO is the work of morons trying to seem smart. These languages are their little intellectual ghetto.