tedster - 2:55 pm on Jun 27, 2012 (gmt 0)
I think every site owner needs to make their own decision - no blanket yes or no. There's certainly little if any direct traffic coming from Yahoo Directory that I can see. And there are certainly many successful sites that never get near the Yahoo Directory.
At the same time, along with the ODP it's been one of the most trusted directories because of a high editorial threshhold. This means it's been used as a seed set for various types of machine learning projects. Being in a seed set of "editorially cleared" sites can be a very good thing.