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But for better or worse it is back. And looks like it will be around for a while I would have thought.
For many the PR toolbar shows perhaps the only tangible results of an SEO's link building efforts.
(This is of course neglecting SERPs, but judging by them is a lot vaguer than a straightforward PR comparison.)
GG does not see the PR toolbar servers as mission critical. For that matter, I suspect that page relevance and placement within the serps is calculated some where else than on those servers.