There's a fascinating little article "Create Advanced Web Applications With Object-Oriented Techniques" by Ray Djajadinata that delves into how JavaScript implements objects, inheritance, anonymous methods, and even a bit about simulating private properties and namespaces.  This may be relevant if you want greater depth in AJAX, particularly the Microsoft flavor ASP.NET AJAX.  There's a sidebar (by Bertrand Le Roy) about the ASP.NET AJAX OOPS implementation and use of JavaScript to add reflection and other .NET familar constructs including properties, events, enumerations and interfaces.