JenSense has the scoop on Google’s policy change that will allow publishers to display competing contextual ad units, alongside AdSense, so long as they don’t look like Google’s ads.
“When it comes to enforcing policies on third-party contextual ads, we’ll be following the updated program policies instead of the T&Cs on this point. That is to say, publishers may now display other contextual ads on the same site or page as Google ads as long as they don’t have the same look and feel as our ads,” Brian Axe tells Jennifer Slegg of JenSense.
Jennifer does warn that you still have to ensure the other ad units don’t have a TOS that prevents you showing alongside others. e.g. Yahoo still won’t let you show their ads alongside other contextual ad units, such as AdSense.