I'm loath to go anywhere near a subject like corporate earnings for various reasons, but Foremski says "There is no explanation from Google or Wall Street analysts that I could find," but anyone can go read Google's Q2 2011 earnings call transcript, which you can find at http://seekingalpha.com/article/279555-google-s-ceo-discusse... . The relevant sentence is "Network revenue was again negatively impacted by the Search quality improvements made during the latter part of Q1, as you will remember, and know that Q2 reflects a full quarter of this impact."
Now go read Google's Q1 earning's transcript at http://seekingalpha.com/article/263665-google-s-ceo-discusse... . The relevant section is "The Google Network revenue was up 19% year-over-year to $2.4 billion. That Network revenue was negatively impacted by two things, the loss of a Search distribution partnership deal and also, what has been broadly communicated, by Search quality improvement made during the quarter. Regarding the Search quality improvement, remember that we regularly make such trade-offs. We really believe that the quality improvements that benefit the user always serves us well both in the short term and in the mid term in terms of revenue."
So Foremski claims that "For some strange reason no one has picked up on this or noticed this huge change in its business model. There is no explanation from Google or Wall Street analysts that I could find." I would contend that Google has actually been quite clear about the reasons for the change in network revenue in its earnings calls.
In particular, Google has been clear in that it's willing to accept an impact in our revenue in order to improve the quality of our search results.