Here is a comparison between the current PG and the upscaled version. I only did the horizontal stretch and left the vertical resolution as is (horizontally scaled to 1128x480 then cropped to the borders). As you can see there is significant resolution to be gained. The current PG is a bit squished vertically from where it should be, so there is another reason to redo it. ;-)
http://i56.tinypic.com/jjlgzk.jpg