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In the recent few months I have increased the number of my Inbound links. They are links manually added on content websites with PR higher or equal to my website, but surprisingly my PR (checked through toolbar and some PR checker websites) has decreased from 5 to 4.
I'd love to know PR experts' opinions about that.
Because PR is a measure that is relative to EVERY other url in the index, as the total number of urls goes up (which it does all the time) your PR can appear to go down even though you have more inbound links tha you did in the past -- it's a math thing.
There's lots more here:
Google PR - Page Rank FAQs [webmasterworld.com]
Do a search in the Google directory, then lookup your site within its particular category. This only works if your site is listed in DMOZ, which the Google directory pulls from.
I suspect that the PR data show on the left hand side is newer and fresher that what is displayed on the toolbar.
I could be wrong on that though.
Bottom line is that Google will not show you current PR, not in any way by any publicly available means. And that current PR is being updated in a nearly continual fashion, all the time.