It's an accepted fact that you're definitely not allowed to put Yahoo ads on the same page as Google ads. We're currently discussing whether or not it is okay to have ads, or links, which probably "mimic" Google ads, but are not contextual. I think Google would regard any ad that "mimics" (looks like) a Google ad as a TOS violation.
as we speak, getting all pages to one ad type. Which is a lot of copying and pasting. Thing is I like Yahoo ads becasue the pay so much, but they are mostly irrelevant. I like google ads becasue they are relevant , but they pay like crap.
This is a very good choice because even though they have said nothing yet about having both ad systems on one page does not mean they will not find out eventually and then just ban you. I agree with you on how much more YPN pays compared to Google. It really sucks that the ads are not relevant at all on many websites, but I keep YPN on mine anyways since I receive more money with fewer clicks.
I am an Adsense user. I can't tell you right now that the page you are showing around violates 2 rules of the TOS. I suggest you get rid of that page immediately... immediately.