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I dont worry about it - the tools seem to show the newest data (for me anyway)
Honestly I dont look at the toolbar page rank anymore, it takes my focus off of what I should be doing ... like building more conent for my customers.
I knew someone was going to say that. If you are so busy "building more content for your customers", then how did you have time to read this thread (with 'Pagerank' in the title) and post a comment? That took more time than glancing at the toolbar. LOL
Everyone assumes there is no useful information to be gleaned from Pagerank trends because of things they have read, and that simply isn't true. If a site drops from PR5 to PR0 overnight, it says something. What? I don't know.
Anyway, if anyone has helpful insight about that particular datacenter or current PageRank trends, then please contribute.
No idea what's going on, but don't worry too much while SERPs improve. PR is supposed to be a gauge of authority. Ironically, the recent anomalies of PR are undermining PR itself; its authority is eroding. Of course this isn't their only problem lately, but it seems more and more as if Google needs to recruit more talented engineers.