Sgt_Kickaxe - 6:04 am on Jun 4, 2010 (gmt 0)
A site I launched 2 weeks ago is showing 0 so it's either automatic or a very recent update.
A site I launched 4 years ago is showing the flatest pagerank flow I've ever seen with homepage X, all categories x-1 and the first two pages of each of those categories at x-2 for each article. No variance whatsoever on any article (25 links per category page, so 50 articles per category all with the same, it starts to vary from page 3 onwards). Incoming links are 95% to the index page where all articles show for a period of time, that might have something to do with it.