Bertrand Le Roy, one of the rock-star developers on the Web Platform and Tools team has been doing a lot of work lately using the new out of band postback features of ASP.NET 2.0 -- you've probably heard of AJAX at this point and this blog begins to discuss the history of the technology and lots of awesome ways that ASP.NET 2.0 makes it super easy for anyone to take advantage of out-of-band updating of web pages without a refresh using XmlHttpRequest -- check it out!

http://weblogs.asp.net/bleroy/archive/2005/04/08/397761.aspx