I was checking Johncow.com PR, but I found it to be PR0 and not PR5. I just went through his site and its very clearly stated that his PR is 0, but he is expecting it to be 5-6, may be got some good backlinks. The domain was registered only in Jul 2007

PageRank? Google you can keep your stupid number!
Yes, this time it´s for real, Google is finally updating the PageRank, but apparently to the downside. It all started with JohnChow.com when his PageRank fell from 6 to 5, but it has spread to other blogs, including CourtneyTuttle.com, NetBusinessBlog.com (where I have a Text Link Ad), and Sabahan.com (where I also purchased a “Earn 10k a month…” link).