Forum Moderators: open
One classifieds site has a strong PR for its main pages (6s, 5's etc for home page, and usually static index pages). The classifieds are all crawlable with 'flat' URLs (non-dynamic) and all of these pages (maybe 60,000) have a white 0 PR bar. Since there is churn of classifieds I assume that they may not remain in the index long enough to get PR assigned.
We still get a large amount of traffic from them though, so the 0 pagerank doesn't initally seem to mean a lot.