I\'ve read ASP.NET Routing… Goodbye URL rewriting? and Using Routing With WebForms which are great articles, but limited to simple, illustrative, \"hello world\"-complexity
Not sure if this is your answer but this may get you in the right direction it's Scott Hanselman (MSFT) showing how to get ASP.NET WebForms, ASP.NET MVC and ASP.NET Dynamic Data -- oh and AJAX to work together in harmony.
http://www.hanselman.com/blog/PlugInHybridsASPNETWebFormsAndASPMVCAndASPNETDynamicDataSideBySide.aspx