Don't obsess over Google PageRank. What you see in the toolbar is several months old, and doesn't affect rankings like it used to. PageRank is now more about crawl frequency and depth, and whether a page is stored in the main index or supplemental index..... Cheers....
True that the results are several months old, but seems like things are getting better. A well known site got his pagerank update few days ago, and went from PR6 to PR5 (speaking about JohnChow.com).