http://blogs.msdn.com/b/dawate/archive/2008/02/15/when-cods-collide-collision-detection-in-xna.aspxBetsy Aoki has posted a great article about collision detection in XNA. Colllision detection is the process of determining whether two or more of your game objects are touching, for example, a grenade hitting a wall, or a ping pong ball hitting a paddleen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)