What are good alternatives to adsense?

What are the other adsense like programs available on the net?Are they as good as adsense? Anybody used any of them? Is the yahoo publisher network similar to adsense?

Yes, Yahoo publisher is similar, and so is quigo...however, very few people have better success with those than adsense, (it happens sometimes though).

Yes Yahoo publisher seems like it is similar to adsense. But I was not qualified for yahoo (I don't know the reason). Google adsense is good and it did qualify me instantly. Yahoo may have not liked the traffic on my site as it was just the launch up and I was not expecting a lot of traffic for first year.