If you have been holding off using Atlas because there was no go-live license, then wait no longer. This month's CTP comes with a Go-Live license so you are allowed to use the code in a production environment. The Atlas web site has also been updated so there is a lot more information.
The easiest way to get started is to consume your existing postback code with the UpdatePanel control. As I have mentioned before, this control intercepts postback events and replaces them with callbacks.
Atlas.Asp.net
Read the complete post at http://www.dotnettipoftheday.com/blog.aspx?id=259