Ajax in Visual Studio 2008 Beta 2: The UpdatePanel

I've been digging deeper into AJAX in .NET (especially in the Visual Studio 2008 Beta 2).  I'll be posting more on AJAX in .NET, but this jumped out immediately when I started looking closer at the UpdatePanel AJAX control:

"While UpdatePanel brings AJAX magic to ordinary Web pages, it doesn't bring the efficiency we normally associate with AJAX. Did you know, for example, that when an UpdatePanel control performs an asynchronous AJAX callback to the server to update its content, the request contains everything a conventional ASP.NET postback contains, including view state? Most developers assume that AJAX eliminates view state. That's not the case, though, with UpdatePanel's brand of AJAX."
http://msdn.microsoft.com/msdnmag/issues/07/06/WickedCode/

.. kinda nice to know since the standard argument for the business case for AJAX (as opposed to the fun-to-develop case) is the reduction in network traffic.