Mine

    public class
    {
        protected Matrix view;
        protected Matrix projection;

        protected Vector3 position;

        protected float pitch = 0;
        protected float yaw = 0;
        protected float fov = 45;
        protected float aspect = 1.333333333f;
        protected float nearClip = 1f;
        protected float farClip = 10000f;

        private bool viewChanged = true;

        public Vector3 Position
        {
            get { return position; }
            set { position = value; viewChanged = true; }
        }

        public Matrix Projection
        {
            get { return projection; }
        }

        public Matrix View
        {
            get
            {
                // Try and avoid a few matrix operations by only updating the view when it has changed
                if (viewChanged)
                {
                    view = Matrix.CreateRotationX(MathHelper.ToRadians(yaw)) * Matrix.CreateRotationY(MathHelper.ToRadians(pitch));

                    view.M41 = position.X;
                    view.M42 = position.Y;
                    view.M43 = position.Z;

                    viewChanged = false;
                }

                return Matrix.Invert(view);
            }

            set { view = value; }
        }

        public Camera()
        {
            position = Vector3.Zero;

            BuildProjectionMatrix(fov, aspect);
        }

        private void BuildProjectionMatrix(float FieldOfView, float AspectRatio)
        {
            projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(45), AspectRatio, nearClip, farClip);
        }

        public void Translate(Vector3 Movement)
        {
            // Move Right
            position.X += Movement.X * view.Right.X;
            position.Y += Movement.X * view.Right.Y;
            position.Z += Movement.X * view.Right.Z;

            // Move Up
            position.X += Movement.Y * view.Up.X;
            position.Y += Movement.Y * view.Up.Y;
            position.Z += Movement.Y * view.Up.Z;

            // Move Forward
            position.X += Movement.Z * view.Forward.X;
            position.Y += Movement.Z * view.Forward.Y;
            position.Z += Movement.Z * view.Forward.Z;

            viewChanged = true;
        }

        public void SetAngle(Vector3 Rotation)
        {
            yaw = Rotation.X;
            pitch = Rotation.Y;

            viewChanged = true;
        }

        public void Rotate(Vector3 Rotation)
        {
            yaw += Rotation.X;
            pitch += Rotation.Y;

            viewChanged = true;
        }
    }