hey, I checked backlink in google for my client today. I notice google knows yahoo directory link structure. Google knows your link in yahoo Directory although the backlink is not a direct link. I know it is not new. but I just know that today. I remember someone asked this question before but not got any answer. So I post this here...maybe it is a clue.
By the time googlebot has visited this directory, it's bound to know it well. It also knows the link structure of any established directories and websites there is online. Google suggests to get into DMOZ or Yahoo directory because they have high PR hence very actively visited by googlebot.
Definitely not. It's does not influence the "algo" but since it's considered quality links, it will surely help you in the serps....just like a backlink from any "quality" site would. Just don't give Y! or DMOZ that much importance. Getting linked from an authority PR6 site for example with the same theme as yours is a lot more powerful than getting linked from the same "quality" PR6 section in Y! or DMOZ.