Google have released a new related links module for your Web site. I try it for a few minutes and I don't really saw a more real relation between the posted text of my post compare to AdSense.
AdSense contamination ?
When I test them on each post of this blog this one show up. It seem been contaminated by the AdSense text of the ads on my page because no post was related to that subject.
May be only for the News tabs it can be sometimes a plus value !