Here's an idea.... Take your google search text box and put it between both 468X60 adsense units. I also would change the button that says google search and rename it to something like Search Files, etc. When I first visited your site I did not know I had to use that google search box to search for files. I would also take the submit button and move it below the text box and center it. This gets readers looking up and down instead of left and right. That's what you want for better eye contact for your ads. Maybe go with some cpm ads. Some revenue is better then none. Anyway, I would stick the banner lower on the page if you use cpm. Take a look at your horizontal link unit stats. If people are not clicking these, remove it. Having too many ad/link units has lowered earnings per click for sites I have tested. Hope this info helps...