as all of you know some days back kenkai s page rank table was discussed here http://www.kenkai.com/google-pagerank-table.htm I also found some other one tables which I found more realistic While kenkais table is prepared when the outgoing links are 50 where as the table below is not prepared like that here the PR varies according to no of outgoing links http://www.services-seo.net/pagerank-calculator/index.php http://www.services-seo.net/link-popularity/index.php I checked it with one of my sites and I got some satisfactory results
So according to this 18.5 is the magic number to get a Boost of one point in the page rank scale. Nice resource. Thanks