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When you go to www.google.com you will actually be served up results from one of these datacentres. Normally these all have the same stuff on them, but during the monthly update, the new results appear on one server, and are gradually copied to the others over a period of a few days. So if you look directly at each datacentre you will see different results. If you do the same search over and over on www you will keep getting different results as each search uses a different, and random, server.
For the last few weeks, Google has been doing some testing at several datacentres, but mostly www-sj,google.com, has been showing vastly different results to the others, as has www-fi.google.com on some occasions.
There are also www2.google.com, and www3.google.com which also point at (redirect to) one particular datacentre, but to which one is changed randomly now and again as Google tests more things.
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Uh Oh! 600 Posts.