Well, at least a Dot Net Slacker ... My first article on DotNetSlackers just got published. It shows how to handle the back button with ASP.NET Ajax using pure server code. Check it out (registration required) : http://dotnetslackers.com/articles/ajax...
I've recently recorded a screencast showing how to enable server-side history management (in other words, handling the back button) in an ASP.NET Ajax application. The whole video is less than 15 minutes total and I build the whole application from scratch...