Thanks for some great articles! I’m using them as inspiration for some prototyping I’m doing at the moment for a new Silverlight game I want to create.

I just noticed a bug in your Vector class, it’s the Normalize() that’s buggy :)
Your code is:
public void Normalize()
{
_x /= Length;
_y /= Length;
}

The problem is that you are using the Length property, whici will calculate the lenght every time based on the x and y. This result in the Length being two different values for the _x / = Lenght and _y /= Length, which again, results in a wrong normalized Vector.

The easy fix I did for this is:
public void Normalize()
{
double tempLength = Length;
_x /= tempLength;
_y /= tempLength;
}

Just wanted to share :)

//Mads Laumann