Tim describes another two different approaches to using the Module Pattern (a way of creating Singletons). The first example takes advantage of the natural indentation to clearly see which methods are private and which are public. The second is a curried function, a function that returns another function.
Christian Heilmann offers another incremental improvement to the Module Pattern, and calls it the Revealing Module Pattern. This defines an anonymous object that contains a list of methods and properties that are publicly available. Christian notes that this method also allows you to set up a public property that's privately generated by a method. Christian's improvement makes it quickly clear which properties and methods are public.