Some may already know the answer to this question, but to make sure I would like to run a test to see if I can figure out exackly what the high, medium, and low means when it comes to page rank on the google sitemaps. I have a site that is pr 6 and shows as medium. So is there anyone who has a pr 7? If so what does it show. Is it high or medium. If you do not have a google sitemap account then create a google sitemap which you can do here for free in about 2 seconds (Sitemap must be named sitemap.xml). Then create a file called googlef3f8f7ed23535e75.html nothing needs to be on it ok if it is blank. Now upload these files to the top level of your server. Once you have uploaded the files let me know then I can add the sitemap to my account and see the results within a few minutes.
You might want to search past message here. Someone already tried create a service for people to submit the sitemap pagerank stats and then share the findings of the sitemaps pagerank system? (if I recall correctly)
It could be that your real-time PR is 5 already. My site is PR0 on toolbar, but my home page is in the Medium.