The referenced forum is for the product ASP.NET AJAX.
As it comes to Silverlight, you can check the links I suggested. In case you are interested in ASP.NET AJAX, you should post your question in the respective forum.
Check out Telerik Analytics, the service which allows developers to discover app usage patterns, analyze user data, log exceptions, solve problems and profile application performance at run time. Watch the videos
and start improving your app based on facts, not hunches.