We have to wait 3-4 months more to its Full launch. Don't know what its taking Yahoo too long to test its system. They have the system there Overture, but whats the problem. I waited desperately for much time. Today I was very happy that the Yahoo Publisher Networking is Launched. I opened publisher.yahoo.com clicked on the signup link, and a sentence came infront of me, Only US Publishers until its beta, I am not a US person, what do I do?, wait and eat potato chips. Yahoo is taking such a long time to lauch its product which is already there (Overture). After this time Yahoo must come out with something better than Google Adsense.
Naw, they're just being careful, as they should. So much will be riding on doing it right, that Yahoo probably just wants to make sure as many bugs are worked out as possible. That's the primary reason for beta testing. Since AdSense is the top dog (only dog), they know they must present a reputable product right out of the gate, or they won't attract advertisers who stick around.