Hello, could anybody suggest me a tool to accurately check the Google Page Rank? The toolbar seem not be frequently updated/accurate. The many web sites around that include PR checker tools, are based on toolbar system or do they update as constantly as Google do?
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.
You're right, Google only exports their internal PR data to the toolbar about four times a year - so toolbar PR (TBPR) is not ever in present time. Also no online or offline tool has a hotline to present time PR values.
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.
My experience is that the Directory PR usually lags behind even the toolbar, which still lags behind "real PR" that Google uses to calculate the SERPs. I suppose it's possible (but not likely) that Google would do a separate PR export when they update the Directory with a new data dump from DMOZ. But my guess is they would take the already exported toolbar number. I've never heard or seen otherwise
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.