In Googles continuous strive to deliver users with the most relevant and meaningful content, they have recently confirmed a change in their page layout search algorithm that takes into account the quality of content at the top of the page (or “above the fold” to use the correct terminology). This is targeted at pages that have a large amount of ads at the top of the page and / or very little, if any, relevant content. Google has stated that “these type of sites may not rank as highly going forward”.
The vast majority of sites should not be affected, but it is a useful reminder that it is really worth thinking about the layout of your page to ensure that your visitors can easily find the information that they are looking for and as in Googles words “Continue to focus on delivering the best possible user experience”. You can find out more about this change by visiting Googles Webmaster Central Blog.