Roughly every 3-4 months we take a snapshot of PageRank values and export them so that the new values are visible in the Google Toolbar. I believe that another set of PageRanks started going out on Friday. New PageRanks are visible at many data centers, but not at every data center. Why not at every data center? Because some data centers are using a slightly older infrastructure for a few query types that are off the beaten path a bit (info:, link:, toolbar PageRank queries, etc.).