3D Animation Techniques (XNA4)
http://www.packtpub.com/article/3d-animation-techniques-with-xna-game-studio-4
Tweening
http://www.packtpub.com/article/3d-animation-techniques-with-xna-game-studio-4
http://www.packtpub.com/article/3d-animation-techniques-with-xna-game-studio-4