Collision Sample
http://xbox.create.msdn.com/ko-KR/education/catalog/sample/collision

Ray structure
http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.ray(v=xnagamestudio.40).aspx

BoundingSphere structure
http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.boundingsphere(v=xnagamestudio.40).aspx

BoundingBox structure
http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.boundingbox(v=xnagamestudio.40).aspx

BoundingFrustum class
http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.boundingfrustum(v=xnagamestudio.40).aspx

XNA4ParticleXML

XNA4ParticleXML.zip

XNA4Particle

XNA4Particle.zip

Creating and Playing Sounds
http://msdn.microsoft.com/en-us/library/bb195038(v=xnagamestudio.40).aspx

Playing a Sound (using SoundEffect)
http://msdn.microsoft.com/en-us/library/bb195053(v=xnagamestudio.40).aspx

Looping a Sound
http://msdn.microsoft.com/en-us/library/dd940203(v=xnagamestudio.40).aspx

Adjusting Pitch and Volume of a Sound
http://msdn.microsoft.com/en-us/library/dd940201(v=xnagamestudio.40).aspx

Playing a Song (using MediaPlayer)
http://msdn.microsoft.com/en-us/library/dd231914(v=xnagamestudio.40).aspx

Using XACT
http://msdn.microsoft.com/en-us/library/ff827590(v=xnagamestudio.40).aspx

XNA4SoundXACT

XNA4SoundXACT.zip

XNA4Sound – using SoundNodeHandler

XNA4Sound.zip