This is shocking news, I mean, we all knew PageRank was not something to look at too closely these days, but for Google to come out and say “The PageRank that is displayed in the Google Toolbar is for entertainment purposes only", kind of shocks me. I can not confirm this to be accurate, but a post at Search Engine Watch just a few minutes ago claims this to be the case. The member said that he emailed Google asking why a page’s PageRank is zero and he got the following response from Google.

http://www.searchenginejournal.com/index.php?p=1105

"Apparently, Google is still using PageRank to rank sites but just not displaying the current value to the Google Toolbar user."

Perhaps more importantly:

"Due to repeated attempts by hackers to access this data, Google updates the PageRank data very infrequently because is it not secure."

So Heisenberg applies to domains as well.