Building a data driven application with ASP.NET Ajax 4.0 and ADO.NET Data Services
Jim Wang (one of the great QA people on the Ajax team) just started a blog, and his first post is a very detailed walk through building a data-driven application from scratch using ADO.NET Data Services and the new client templates in ASP.NET Ajax 4.0.
http://weblogs.asp.net/jimwang/archive/2008/11/05/working-with-ado-net-data-services-in-ajax.aspx