I have a PR4 Tech website: www.NetbookFreeware.com. It gets 10,000 visits and over 22,000 page views per month. More than 70% of traffic is from search engines. Highest number of visitors come from US, UK, and Canada. I am selling 125*125 ad block on this. The ad will be shown on sidebar at the top (where Google ad is currently displayed). It will be visible on all pages, including home page. I am selling the ad for $10 per month. This is a very premium position, and this is a very good price for it. PM me if you have any questions.