I find oddities similar to that on occassions, where www shows a different ranking than any of the datacenters. Sometimes it's just timing, but at other times I've wondered if there is at least one datacenter that we don't know about.
And on the subject of #1s - I just found that wws is #1 from 13 million results for the searchterm, "articles about tools". Once again I'm forced to say - now that's what I call a relevant result
