TheMadScientist - 9:58 pm on Jul 3, 2010 (gmt 0)

Absolutely genius point!

Except for the fact using your theory would only remove the PR flow from a specific page, not the entire site or every page on the site, so to really 'ruin the PR distribution' you would have to do it on the entire website, or a significant portion at least. Seems like a 'small trade off' for Google to prevent PR sculpting, IMO... And if it is applied situationally as I suggested, then it might not even do that.