Well after dealing with far too many Inappropriate Ads on the Yahoo! Publisher Network, I've determined that Yahoo! just doesn't have the foothold to make it valuable enough service for my webpages.

I demand excellent targeting, and Yahoo! doesn't provide that. Thus, I've decided to abandon use of their Publisher Network on the majority of my webpages until such time as I sign up with Google Adsense or they improve their targeting, which I'll keep an eye open for.