Google has announced it is removing its right side-bar ads. So the Search engine results page (SERP) can look like - 4 ads on the top, 10 results (plus an image results view), and 3 Text Ads at the bottom.

This means that ad words just got much more competitive. It's not clear whether SEO will be directly impacted.

Here is a search on Absence Management - the four ads at the top mean extra scrolling; Google has added the "Image" view as a result; and there are three text ads at the bottom.

Here is a good article the further elaborates: http://www.wordtracker.com/blog/google-confirms-a-four-ad-format-ending-sidebar-placements