So, this is the beginning of the end of PR from Google itself? If they don't want us to check PR, it might be indicating that. I still see PR in the toolbar though. Firefox add-on shows it too.
Looks like a PR prediction tool to me. I think the real PR checker is this one http://www.rankalert.net/pagerank-checker.php at the same site. Anyway it gives different results compared to www.prchecker.info, the one that I use.
You can use google tool bar to check PR. Anyway, I have 3 sites, and I haven't seen any changes in PR.
you can use this script, I posted it in freebies subforum, hope work regards pagerank checker script (multiple datacenters)