3D visualization working solutions:

http://isvis.com/work/silverlight/3d/tracking/

http://channel9.msdn.com/coding4fun/blog/Were-all-one-little-world-as-shown-with-the-Silverlight-5-3D-sample-Solar-Wind

3D Freaking Awesome post by MVP, Rene Schulte

http://kodierer.blogspot.com/2011/04/silverlight-5-3d-slartoolkit-augmented.html

3D: A Clarifying blog:

http://blogs.claritycon.com/blog/2011/05/26/1703/