I have been doing AJAX in ASP.NET for a while using frameworks like Anthem.Net and AJAX.net. I did not use Atlas as Atlas was still in development and more over our client has not upgraded to .Net 2.0 yet. I have started playing with Microsoft ASP.NET AJAX (formerly Atlas) for a week now. At first I was really overwhelmed with the whole Atlas documentation but felt a little comfortable after watching the Ajax videos on ASP.NET website . Here I will go through the process of getting started with Microsoft ASP.NET AJAX. You can access this post here on Google docs. http://docs.google.com/View?docid=dd8p9vd3_7dzckx7 Install MS AJAX Download and install Atlas from here.( http://ajax.asp.net/downloads/default.aspx?tabid=47 ) Visual Studio Tool Box After installing MS AJAX, you should see AJAX Extensions tab in the visual studio tool box. New ASP.NET project template A new project template that allows you to create ASP.NET AJAX enabled Web applications is also installed on installing Atlas.