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But the earnings were very bad. They were really bad for me. For instance - if I am making 20$ on AS, I was making 2$ on YPN. I tried for 2 weeks but nothing improved - so I came back to AS.
You cannot show both YPN and AS on the same page. But you can rotate them or you can show YPN ads for US visitors and AS for international.
Another limitation abt YPN is - if you have too much international traffic clicking on the ads - you will get BANNED :) - its only for US rite now.
I have a mix. AS on some sites, YPN on others, but for me, my revenue tripled on the sites now using YPN.
I and others in the YPN beta initially saw some above-Adsense earnings. Then things went south; in many cases way south. In my case, I removed YPN from my site several weeks ago and am 100% AS until the Next Best Thing comes along.