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www-sj and www-zu redirect to other data centers.
www2 and www3 are more stable because they usually resolve to the same IP.
The others I don't know.
It's easy for me to see this. I just query on one of my sites that has remaining PR and check out those datacentres where it no longer appears when searching for its domain - i.e. PR reduced to 0.
Looks like they missed a site this time (it still has +ve PR) but I'm sure they'll get around to it next time.
So well done to Google. All my sites but one now PR 0. It makes me wish I'd stuck some spam or x-linking or something in there. Or a least a "Google sucks" page.
What a joke.