RegDCP - 6:48 pm on Sep 1, 2012 (gmt 0)
surely you can find a lot of exceptions in every niche. ;)
Those are just 2 of the major directory sites.
Matt Cutts told us a short while ago that nofollow links are but a very low single digit percentage of all links.
This would seem to indicate that the nofollow parameter is not a huge success in Google's eyes.
I'm going to go out on a limb and say that Google has other ways to determine if a link should or should not get "link love" for PR.
I think that relevance would be the metric.
If a page is relevant and adds to the information silo, a nofollow markup would take away form the total.
If a page is not relevant and has a dofollow tag, it is discounted.