From Mozilla: An overview of the object-oriented capabilities of JavaScript. This covers OO concepts of classes and objects, instances, abstraction, encapsulation and polymorphism as done in JavaScript with functions and prototypal inheritance.
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.
Tim explains object orientation in the context of JavaScript, covering concepts like object literal, encapsulation, inheritance using prototype, composition through association and aggregation, polymorphism. Useful read for OO-aware developers to grasp some of the potential of JavaScript.