On my current project I was tasked with exporting our map layers to Google Earth. This was simple for the ESRI ArcGIS Server layers, since Server has out-of-the-box support for KML. However, as would be the case, we don't use ArcGIS Server for all of our layers. We also use ESRI Graphic Layers for rendering user markup and data from various data sources. This presented a challenge to export these layers to Google Earth. Specifically, we wanted to maintain the same rendering and symbology that we used on our Silverlight maps in Google Earth.