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The normal PR (not that shown in the toolbar) would normally assign a -1 PR level to any subdirectory under the root page.
ex. site.com/index.html=PR4
site.com/category/=PR3
site.com/category/subcategory=PR2
and so on
This is with a natural (old school) linking pattern for the web - assuming there are no links from the outside to the subcategory pages and all link trades are done to the index page.
Almost all web sites on the net went down by around 1 PR on the toolbar because the PR of the Google Directory Link Pages went down by 1 PR level the last update(approximately - like was mentioned its a log scale so its not exact)
More important though - the toolbar PR is not only out of date - its also a very poor indication of real Page Rank of a web page these days - too many SEOs use it so Google is going to make it what ever they want to prevent link-renting etc.
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