I have tried YPN on a few of my sites and given it a few hundred thousand page impressions to prove itself and it doesn't do as well as Adsense for me. I tried it on a forum and a number of business and technology sites and the YPN revenue was about half of Adsense. I expected less than most do with YPN since over half of my traffic is from Europe, Australia, and India and corporate traffic tends to be more Google oriented. Someone mentioned that legal sites do well. What other segments or niches do well? I am not asking for your specific site or niche but just general segments and niches.
Do you have a vonage phone site? I have some music related sites that seem to pull relevant ads. Have had issues with many sites getting ads served.
I have some non-business, non-technical sites that might be good for general interest ads like vonage or music. Are your music sites downloads, lyrics, sheet music or other?