A month and a half ago, Google began testing Google AJAX search results, which caused a major uproar amongst webmasters who were unable to track referrer information in their analytics package. Google released a statement that they test things all the time and didn't say more. Soon after, AJAX search results went away and we forgot about it.
Right, and that is what most of us assumed. So Brett followed up by asking Matt, "why didn't they just come out and say that?" Matt replied, "that's nice feedback and he would let them know".
Some actually think Google is starting the AJAX test again. SEO Smackdown reports again, seeing it. He said that to get around the referrer problem, Google is passing variables in the click through URL that Google Analytics understands, but other analytical programs do not. Of course this is not the solution and he says so. I also see the URL parameters in my searches, but I am not getting the AJAX search results.
Google is a big company. Google Analytics was upset that the Google search UI team did this. Google's search UI team had no idea of the implications of their change.