WCF ExceptionHandling in Silverlight

I have recently done some LOB application development in Silveright in which we used a WCF service to communicate to the backend. There was an unexpected surprise that Exceptions throw in the WCF service were not transferred to the Silverlight Client! In Silverlight you always get a System.ServiceModel.CommunicationException: The remote server returned an error: NotFound.... error. We wanted to