Dates of Google PR updates
Google periodically exports the internal PR data that they update internally on a daily basis to the Google Toolbar for us to look at. The most recent dates of the export were approximately:
(4 Jun 2010)*
3 Apr 2010
31 Dec 2009
30 Oct 2009
23 Jun 2009
28 May 2009
1 April 2009
31 Dec 2008
27 Sep 2008
26 Jul 2008
26 Feb 2008
11 Jan 2008
27 Oct 2007
29 Apr 2007
14 Jan 2007
The dates are approximate as an export can take time roll out to all data centers and there are time zone differences.
*Not a real true update, but a lot of sites got reductions in PR
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