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thanks!
PR will be travelling down to all the pages that google has crawled to, and knows about.
PR0 is not necessarily zero, but something less than 1.
If those deeper pages showing PR0 have been crawled and are in the index, then their PR is just something less than 1.
I suspect you have a lowish PR4. You'll start to see PR showing on the deeper pages with a little time, or with a higher PR on the pages that link to those deeper pages.
I would suggest you create a sitemap, linked to from the homepage and containing links to your deeper "money pages". This will help google in finding and spidering those pages.
PR4 on a smallish site should be fine as far as getting pages indexed in google is concerned. You might want to start trying to get some inbound links to the deeper pages from off-site sources as well as keeping new inbound links coming into the homepage.
TJ