   Thumbnail screenshot in XNA
  OK, my brain's not working today. I'm trying to capture a thumbnail screenshot in XNA, so I create a 128x128 texture, set it as the render target, render, then save it. The problem is that it's only capturing the 128x128 top left corner of the screen, not rendering the full image to the texture. My view and projection matrices are the same as when I do the full render, and I've set the viewport to 128x128, so this should work, right?   
  Never mind. I was forgetting to scale my sprites down :)   