Some of the google examples you cite don't use xml at all. Do I have to use xml and/or xslt in an ajax application?
What is the role of the scriptmanagerproxy control? : asp.net ajax
Describe the animation extender control and the method by which this control is utilized?
How can you find out that an ajax request has been completed? : asp.net ajax
What are the goals of Ajax?
What is the name of the DLL that contains Ajax control tool kit?
Is ajax a technology platform or is it an architectural style?
Does ajax have significant accessibility or browser compatibility limitations?
Should I use xml or text, javascript, or html as a return type?
When not to use JSON?
What are all the security issues of Ajax?
what is the active x dll used for ajax. explain y we use ajax?
What is the work of the conformonformsubmit property in the confirmbuttonextender control? : asp.net ajax