The guys over at Chart FX have long done some great .NET data visualization controls... recently they turned their attention to Silverlight and have done some pretty cool stuff.   They are leveraging ASP.NET to give a very nice end-to-end story that helps customer move forward with the power of Silverlight easily from where they are today.. 

http://demo.softwarefx.com/Silverlight/Chart/Galleries/ 

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Enjoy!