I like the "zoom" example - but it looks like there is more to the picture. Maybe you could include an indicator that shows when you have hit the edge of a page?
I looked at the source image and there wasn't any more to the image. Of course, the only reason I checked is because I had the same feeling, so I didn't like the panning. It didn't feel responsive, and I had to move the mouse all the way from the bottom to the top to pan the full image. If they tightened the panning and added a top indicator, it would be much better.