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Thanks.
First, congratulations on you 6 PR. That's very good, IMHO.
Google does get its directory from the Open Directory. However, due to some technical issues, Google's copy of the directory hasn't been updated since late September.
What is likely is that the Googlebot found your listing in the DMOZ directory itself. This link probably accounts for some of your good PR in this month's update.
Hope this helps.