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Two major proofs for this are: A. Google did not synchronize its directory with Dmoz for a long time (for more than four months). B. There are some categories in Dmoz that their PR is 0! I wouldn’t suspect anything, except for the parent categories that have a high PR (7/10).
I would not trust the toolbar at the moment - if these are new categories(by this I mean March - April time) then they may have a white bar.
Many people in this forum are reporting that pages that previously had higher PR now have PR0. I think this is just part of the current process that is going on ("Dominic update") and that it will be corrected with the next update.
See Googleguy's comment in this thread:
[webmasterworld.com...]
Beth