Reviews on PR Update since Sep 29

Since the recent PR update of Google at Sep 29, I found most of the sites' PR increased back. Compare with Apr's and Jun's update, I think they have the following relationships:

Apr v1.0 (1) => Jun v1.5(2) => v1.1 => Sep v2.0 (3)

1. used a new arithmetic (new framework?) for PR which caused many new sites which even had zero PR got high PR easily. PR seems to be easy to get for new sites.

2. arithmetic adjusted: fixed the previous bug on new sites which got high PR. This is a failed test for Google PR, somebody use this time to improve his sites successfully. Conclusion: It's a good time to promote your site when Google made mistakes.

3. version 2 update of Apr arithmetic, add some new characters, Google spider will more like unique contents and aged domain. I believe Google use another trust PR to rate a site, but not the green bar on your toolbar.