Take my own blog as an example; the PR of my website’s homepage, which was 4, has not changed, but the PR of the blog’s homepage has dropped from 4 to 2. Many single pages that originally had a PR of 3 have now been reduced to 0, or even have no PR at all. Of course, this may be related to the fact that I am currently undergoing a Google penalty for devaluation.
[Source of this article: http://www.birdpig.com/post/google-pr-gengxin-2008-8-24.html]