The big image at the top of the page is begging to be clicked. Should definitley be linked to your sponsor. There's a pretty good chance that a few surfers will click on that before they even reach the content.
I've also found that having text links in between image rows does a bit better than having all the content together with text links above and below it all. That way, the surfer can't help but notice the text as he scrolls down the page.
