easiest & most flexible is still this:

  var myNamespace = {};
  myNamespace.foo = function() {
      var privateFoo = 1;
      this.publicBar = "test";
      
      var privateFn = function() {};
      this.publicFn = function() {};
      return this;
  }

  // usage
  myFoo = new myNamespace.foo();

as crockford says & in my experience http://javascript.crockford.com/private.html

this also allows you to do prototypal inheritance, which is not possible with other "module patterns" - whatever that is, they are just singletons.