I updated all the sites in my directory to see if there is a general trend... and yes, most PR's are going down, especially directories and blogs...
On the other hand, I saw massive increase of PR (from 0 to 6) on some directories...that are hosted outside the US

(I mean with a non-english visitor profile)
Seems to me that there was a big "manual" intervention on this PR update with a special focus to heavily and wellknown directories on the US market.
Just my feeling...
Did any of you directoryowners made a general update of the PR in your directories ?