It seem that finally we have a new PR update. It's still affecting only (or at least mostly) new websites that didn't had PR before.

Discussion at Digitalpoint:
http://forums.digitalpoint.com/showthread.php?t=107899

PR checking tool on multiple DCs:
http://livepr.raketforskning.com/

no kidding!!! I have a page rank of four on my blog now, and i used to have none!!! Sweet.. if it stays... :)

http://blogoscoped.com/forum/42443.html

http://ko.bloggingstocks.com/2006/07/12/google-tweaks-formula-to-thwart-landing-page-con-artists/