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CainIV - 7:36 pm on Feb 9, 2006 (gmt 0)
Keep in mind that all pages in a site reinforce each other. google looks at site size, linking pages as well. It could be that many pages of your website (inner pages) that are still important are not indexed. Can you see new cache dates for the pages that are within two clicks in?
I have heard other fellow SEO's talk about changes in ranking going from U.S. based to U.K. or Canadian based servers. However, if this geo targeting of servers exists, I would have not thought to the level that you have seen.