Google Weblog a nice blog! Right now they have a good post on Google’s policy:
Google’s long-standing policy of not accepting AdWords for any site they deemed ‘Anti’, which previously banned ads for a weblog criticizing actor John Malkovich’s anti-semitism, has now been used to stifle more political speech.
It is a well thought out item, not critical of Google’s control over their ads as such, but more on how they do it.