What are the differences between ajax and javascript? : asp.net ajax
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 are all the browsers support AJAX?
What are the important methods of xmlhttprequest?
How can we handle concurrent requests?
What are the requirements to run asp.net ajax applications on a server? : asp.net ajax
Is it possible to use fileupload control within the update panel?
What is the asp.net ajax framework? What versions have been released so far?
What are the extender controls? : asp.net ajax
What is update panel?
What is ajax method?
Describe how to handle concurrent ajax requests?
Is it possible to set session variables from javascript?