Its been years yahoo is running YPN. but I wonder why they don't grow it worldwide and compete with adsense. they have reputation and money but the only things that comes into my mind is that, they are lazy. publisher still are looking for better adsense alternative, but there is no such effective alternatives. Why yahoo why? may b yahoo will read this thread
coz they know tthat if they wil compete with adsense,,they will suerly loose,,,so they want to maintain friendship with google