According to Matt Cutts, there is one data center that is live with caffeine. 1. I see vastly different rakings using the data center ip with no country code versus &gl=us would the &gl=us be more accurate for US results. I wonder which results will actually show up for a US user that goes to google.com? I am talking change variations from position 12 to position 2. the better positions on all words are with the US modifier, any insight here? 2. when the caffeine results become live---do you think they will match the results in the tool or is an estimate. I am asking how accurate are the caffeine results that google provides to the real thing coming out? Let's start a good discussion here, here is a refence: http://www.webmasterworld.com/google/3604964.htm