A kerala based techie has creaed a micro blogging site code named Silverdraw (http://silverdraw.com) based on Silverlight and WCF Polling Duplex. According to Anoop Madhusudanan, the creator of the platform, Silverdraw is realtime white board that can sync information between various participants, using Silverlight + WCF Polling Duplex. Presently this is a just a POC implementation. Users can draw together in the white board, and may chat each other.
You will find more details regarding the project at http://amazedsaint.blogspot.com/2009/11/silverlight-wcf-duplex-services.html. The source code for the project is available for download at http://silverdraw.codeplex.com/
The creator has published an article at CodeProject which can be viewed at http://www.codeproject.com/KB/silverlight/silverdraw.aspx
Keywords: silverlight, microsoft, aspnet, anoop, codeproject