There seems to be a Google Toolbar PageRank update going on right now. We have threads on the topic at WebmasterWorld, DigitalPoint Forums and HighRankings Forum. The update seemed to have started sometime yesterday afternoon and many SEOs and webmasters are chatting about it now.
The last PageRank update prior to this one was in June 2009, which may have just been a technical quirk because the one prior to that was just a month before in May.
In any event, like I say every time:
Yes, a Toolbar PageRank update means nothing in terms of your ranking changing anytime soon. The PageRank scores shown in the toolbar are outdated and have zero direct impact on your Google rankings. That doesn't mean that PageRank has no influence, but the toolbar score does not have any influence. Google shows us one thing, but yet uses another thing.
Forum discussion at WebmasterWorld, DigitalPoint Forums and HighRankings Forum.
