There was some change from Google this week again. I believe that the algorithm is changing and that causes the movement. Google is trying to perfect their mathemathics equation for PageRank so that there is little to no black hat in cheating PageRank.
Most of the site who had movement end up having PageRank of 0 (yes, a round egg), no one gain as far as I know from this movement. Here is some of the PageRank 0 websites. This post was mainly targeting at PayPerPost Blogger, but I am not really sure. Anyhow, PPP is trying to start their own IZEA RealRank to rank their own blogger. This may not be official, but you can check your RealRank here. I got a 50/100 (that is PR 5, if that is true).
RealRank algorithm is very simple
70% weighted towards visitors per day
20% weighted towards amount of ACTIVE inbound links per day
10% weighted towards pageviews per day
I will be updating my post about Blogs with Top Commentators WordPress Plugins as there is a lot of changes in the list. This list will be updated, I am waiting for this movement to calm down. All of the PR2 blogs did not survive this movement, I have no idea why.