Google Big Daddy SearchQuake About to Rumble Your Ranking?

Running ranking reports for clients is a standard part of an SEO's job. This week I created a position report for a client - one for which we'd made significant gains in ranking for their targeted search phrase - and proudly sent off the report to them before a scheduled conference call to discuss our progress and status. The client sent an email upon receiving the report saying "There is something wrong with your report - we rank higher than this report claims." I went back to Google and typed in the search phrases to find rankings exactly where the report showed them the previous day. I explained to that client that Google has (at last count) nine data centers which serve up search results and that they were getting results from a data center in the Eastern US which showed differing results from results shown to us here in California. The difference was substantial enough to move the client from page two to page one in the search results and therefore made a dramatic difference in their satisfaction with our work. Differences are rarely that substantial in previously observed ranking reports, so it prompted me to dig a bit deeper into the issue and I sent the note below to the client. "Take a look at this link where Google datacenter IP addrresses are listed in detail." http://WebSite101.com and blogs about SEO at