There have been some reports that Google bouncing new pages in search results. You can read one such story at DigitalPoint[ http://snipurl.com/geeklord200801 ]. Also, there are articles about that Google Search Algorithm Update [ http://snipurl.com/geeklord200802 ] and [ http://snipurl.com/geeklord200803 ]
If that is true then certainly the PR would matter less in SEO techniques. Also, it would be hard to keep site rank constantly high on the Google SERP for a long time.
You are doing a great job at this blog! Although I am not convinced with the fact that too many people are writing about Google PR. You could bring this entire google topic down and increase the ambiance of this blog.