article-version.js

//our app
var HelloEmber = Ember.Application.create({});

//our model
HelloEmber.Greeting = Ember.Object.extend();
HelloEmber.Greeting.reopenClass({
  get : function(){
    return {greeting : "Good Morning Starshine!", happyThought : "The Earth Says Hello!"}
  }
});

//our route
HelloEmber.IndexRoute = Ember.Route.extend({
  model : function(){
    return HelloEmber.Greeting.get();
  }
});

toms-version.js

//our app
var HelloEmber = Ember.Application.create({});

//our route
HelloEmber.IndexRoute = Ember.Route.extend({
  model : function(){
    return Ember.Object.create({
      greeting: "Good Morning Starshine!",
      happyThought: "The Earth Says Hello!"
    });
  }
});

with-class.js

//our app
var HelloEmber = Ember.Application.create({});

HelloEmber.Greeting = Ember.Object.extend({
  greeting: "Good Morning Starshine!",
  happyThought: "The Earth Says Hello!"  
});

//our route
HelloEmber.IndexRoute = Ember.Route.extend({
  model : function(){
    return HelloEmber.Greeting.create();
  }
});