I don't know much about this, but the paper is short and an interesting read. For me, it pointed out the issues to take care of when using an AJAX-like technology. So, if you use XmlHttpRequest, read this.

Why is it .NET related? Well, as of the writing, supposedly many "AJAX frameworks" can be "hijacked", including Atlas.

http://www.fortifysoftware.com/servlet/downloads/public/JavaScript_Hijacking.pdf