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Receptional_Andy - 9:10 pm on Nov 25, 2009 (gmt 0)
Maybe there is also some randomisation procedure at individual data centers, or as a consequence of Google splitting requests to the same IP over multiple servers. Sometimes it would be helpful if Google kept things simple ;)
Good point again, I remember disabling cookies/js myself when testing the appearance of the breadcrumb trail snippets just a few days ago.