More abnormal events arising from this past Google update. I have heard several reports in the forums and via email on sites where the home page's PageRank value has been knocked down to zero but the inner page PageRank values of the same site have remained constant.
There is some forum coverage on this currently taking place at SearchEngineWatch Forums, I will try to find out more information over this week.
[added]Here is a new thread at SEO Chat on this exact topic.[/added]