http://blogs.msdn.com/robinm/archive/2008/10/14/silverlight-for-developers-part-ii-powerful-technology.aspxSILVERLIGHT HAS THE MOST COMPREHENSIVE RUNTIME ON THE WEB TODAY. EXPLOIT ALL THE RICHNESS OF THE .NET BASE CLASS LIBRARIES INCLUDING XML, LOCAL STORAGE, INPUT/OUTPUT, GLOBALIZATION AND GENERICS. The Common Language Runtime (CLR) provides the underlyingen-USCommunityServer 2.1 SP1 (Build: 61025.2)