The magic behind live bindings explained

Dave has a fantastic and very detailed post about our implementation of the Observer pattern in ASP.NET Ajax 4.0.

This feature is what enables the live bindings to work.

Check it out!
http://weblogs.asp.net/infinitiesloop/archive/2008/11/09/asp-net-ajax-4-0-observing-updates-to-pojos-plain-ole-javascript-objects.aspx