http://msdn.microsoft.com/en-us/library/bb203909(v=xnagamestudio.31).aspx

http://xbox.create.msdn.com/en-US/education/catalog/sample/chasecamera

http://roecode.wordpress.com/2008/02/15/xna-framework-gameengine-development-part-12-culling-and-chase-camera/

4.1 Third-Person Camera Navigation, Section 4, Game Programming Gems 4

Getting Started with 3D, 3D Graphics with XNA Game Studio 4.0

Third-person Camera Navigation