move a model

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=712432&SiteID=1

This is the movement I use for my camera, you should easily be able to use it for your model. It includes moving backwards and forwards, strafing as well as rotation. This is assuming you want to move freely in all directions. If you want to stay level on the X-axis take out the line with CreateFromAxisAngle in the rotation method. BTW, I got this from http://www.two-kings.de/tutorials/basics/basics01.html

(Call move then rotate)

private void Move(GamePadState currentstate)
{
Vector3 direction;
direction = cameralookat - cameraposition;
direction.Normalize();

cameraposition += direction * (currentstate.ThumbSticks.Right.Y * 2);
cameralookat += direction * (currentstate.ThumbSticks.Right.Y * 2);

direction = Vector3.Cross(direction, updirection);
direction.Normalize();

cameraposition += direction * (currentstate.ThumbSticks.Right.X * 2);
cameralookat += direction * (currentstate.ThumbSticks.Right.X * 2);
}

private void Rotate(GamePadState currentstate)
{
Vector3 direction, rotationaxis;
Matrix rotationmatrix, zrotationmatrix;

direction = cameralookat - cameraposition;
direction.Normalize();

rotationaxis = Vector3.Cross(direction, updirection);
rotationaxis.Normalize();

rotationmatrix = Matrix.CreateFromAxisAngle(rotationaxis, MathHelper.ToRadians(-currentstate.ThumbSticks.Left.Y));

zrotationmatrix = Matrix.CreateRotationY(MathHelper.ToRadians(-currentstate.ThumbSticks.Left.X));

direction = Vector3.Transform(direction, (rotationmatrix * zrotationmatrix));
updirection = Vector3.Transform(updirection, (rotationmatrix * zrotationmatrix));

cameralookat = direction + cameraposition;
}