A WebmasterWorld thread talks about how they noticed how the Yahoo! Directory pages are showing a PageRank score that is typically lower than what they showed in the past.
A member says based on that, "Looks like that $300 link was worthless."
As you know, it cost $299 per year to get reviewed to be included in the Yahoo! Directory. So he feels that the $299 he spent is not worth anything because the page with the link has a low PageRank.
Forum moderator, martinibuster, responds that it is not that simple.
Passing the review process of the Yahoo directory says something positive about a website. The toolbar doesn't reflect that.
I agree. Google knows Yahoo! tries their best to only include quality sites within their directory. Even if a page in the Yahoo! Directory has a low PageRank, it doesn't fully represent the importance of such a link.
I may be going off on an edge right now, but I believe that a Wikipedia link, even though they are nofollowed, can be valuable. If not today, I think down the road.
There is more than meets the eye when it comes to links. It is not just about PageRank or if the link is going through a redirect or even if it is nofollowed. It also depends on the source.
Forum discussion at WebmasterWorld.