WebProNews also has a good article on Ad Placement on websites:
‘Advertisement drives the revenue of the Internet industry. Learning about the science associated with successful ad campaigns can only benefit you and your site. With this in mind, a study performed by Eyetrack III attempted to determine which sections of a webpage the human eyes focus. Eyetrack accomplished this by creating mock pages containing text and advertisements. Test subjects then reviewed the documents while Eyetrack monitored where their eyes focused….
“Advertising placed on top and in the left column of the page was viewed most. Ads placed at the bottom of the page were viewed least.” On their first mock-up page, 68% saw/focused on ads that were positioned in the top left of the page; conversely, ads appearing at the bottom of the page were only viewed by 14% of the test subjects….
researchers found that ads that blended into surrounding editorial content on a news homepage attracted people’s eyes more often than ads that featured contrasting colors or designs.’
Read more at Ad Placement You’re Getting Warmer