Less PageRank Floating Around In SEO Niche

Matt Cutts says in a comment over on a pretty interesting post at SEOmoz - we did do a full PageRank update several weeks ago - there’s less PageRank flowing around in some areas (e.g. search and SEO). Vanessa Fox’s site dropped by one as well, and for her as well, it’s just a case where less PageRank is flowing in some niches of the net. PageRank doesn’t always monotonically increase.
There’s lots of other good info from Matt over there too, but that one bit about there being less PR flowing through the SEO niche got me wondering…