The Microhoo search alliance isn't working. That's according to Matt Rosoff, who notes that Yahoo's search revenue declined 15% in Q2 -- the most recent quarter -- compared with the prior year. Revenue per search hasn't panned out to meet expectations for either company. There are several reasons why -- including that many searches do not serve up ads because adCenter can't match them properly. That's not a click problem, but rather a platform issue.