It is interesting, I have also noticed that sites that are linked to from this directory have had increased
PR.
There was a point a few months back, when this sites
PR dropped from 4 to 3, this happened after including a certain recuprial link. I then removed that link and on the next
PR update, it jumped to 6. The linked site in question has now been taken offline, it was a link-farm - can't remember the name of it....