basic module function

breakfast.js

(function(self) {

  self.Model = Backbone.Model.extend({
    defaults: {
      beverage: 'Orange Soda',
      yogurt: false,
      fruits: ['Apple', 'Plum', 'Watermelon']
    }
  });

})(module('breakfast'));

meals.js

(function(self) {

  // Import the breakfast module
  var Breakfast = module('breakfast');

  self.Views.ShowBreakfast = Backbone.View.extend({
    initialize: function() {
      this.breakfast = new Breakfast.Model();
    },

    render: function() {
      console.log(this.breakfast.toJSON());
    }
  });

})(module('meals'));

module.js

module = function() {

  // Internal module cache.
  var _modules = {};

  // Create a new module reference scaffold or load an
  // existing module.
  return function(name) {
    // If this module has already been created, return it.
    if (_modules[name]) {
      return _modules[name];
    }

    // Create any custom properties you want all modules to have access to.
    // Return the module.
    return _modules[name] = { Views: {} };
  };

}();

Check this out: https://gist.github.com/1206902