WCF 3.5 provides the ability to easily expose services to AJAX client applications. Specifically, the webHttpBinding has an "AJAX-Friendly" endpoint behavior. What do I mean by "AJAX-Friendly"? To me, it means that we will create a client proxy that knows how to call your service from an AJAX client. What used to take dozens, if not hundreds, of lines of code now takes 3. In this screencast, Rob Bagby will illustrate how this works in great detail.