On design patterns: When should I use the singleton?

Question

The glorified global variable - becomes a gloried global class. Some say breaking object-oriented design.

Give me scenarios, other than the good old logger where it

Answer 1

An example with code, perhaps.

Here, the ConcreteRegistry is a singleton in a poker game that allows the behaviours all the way up the package tree access the few, core interfaces of the game (i.e., the facades for the model, view, controller, environment, etc.):

http://www.edmundkirwan.com/servlet/fractal/cs1/frac-cs40.html

Ed.