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Real PR is being updated continually - but only exported for public view on the toolbar every 3 months or so. The public link: results get changed a bit more frequently, but they don't mean very much -- just a sample of all the links that they switch around.
[edited by: tedster at 3:42 pm (utc) on Mar. 7, 2007]
Seems to have been a positive (for me) change in ranking too.