My sites used to get a trickle of traffic from DMOZ, about 5-10 visitors per month per site, but that was back in 2005-2007. Now there's hardly any traffic from them. I think there's been a similar pattern with the Yahoo directory. I don't have any sites in it, but I read somewhere that it doesn't send nearly as much traffic as it used to. The way that people use the web has changed.