some url

1.MVVM with Silverlight (Begin to End) : http://code.msdn.microsoft.com/MVVM-with-Silverlight-09a2493a

Balder - 3D engine for Silverlight, Windows Phone 7, Xna and OpenGL: http://balder.codeplex.com/

 

Silverlight - Changing ComboBox list based on value of another control :http://code.msdn.microsoft.com/Silverlight-Changing-64400600

Tagbox - a bindable silverlight entity selector :http://code.msdn.microsoft.com/Tagbox-a-bindable-10f5b739

Drag and drop file to Silverlight app (CSSL4FileDragDrop) :http://code.msdn.microsoft.com/Tagbox-a-bindable-10f5b739

3D Housebuilder demo from MIX11 :http://code.msdn.microsoft.com/3D-Housebuilder-demo-from-def4af04

MVVM Sample for WCF RIA Services :http://code.msdn.microsoft.com/MVVM-Sample-for-WCF-RIA-115b1f38

微软称中国已有30%的PC用户安装Silverlight:http://www.cnbeta.com/articles/53538.htm