Hi. I've seen this on a few sites. Is it against Google or Yahoo's TOS to have both google and yahoo ads on the same site/page?
The best way to do it would be use geotargetting and show US traffic YPN ads (since YPN only pays for US traffic) then to the rest of the world show Google Ads. As stated above, You cannot have both on the same page at the same time.
Geotargetting is where you try to locate the user via their IP address to a country/place in the world. Advertisers like to Geotarget their ads to specific reasons. But also publishers may want to show specific ads to users in certain countries. ESPECIALLY for YPN, which expels some people from the program for having too much international traffic. There are php scripts such as phpadsnews which can do geotargetting for you. Alternatively if you have a bit of php knowledge, you need to write a script to get the info from something like hostip.info and then depending on what country is returned, decide which ads to show
How is that possible. I think you mean: Same site, yes. Same Page, no! I've had them on the same site for awhile with no problems, I just get better results from adsense.