What's your opinion of TradeDoubler.com? I have a site using it alone and other sites with just adsense. The adsense does much better. Do you know of sites that do well with tradedoubler.com?
It's probably because with Adsense you earn per click and with Tradedoubler you mainly only earn per sale. Tradedoubler is a good and reputable UK affiliate network that I have used previously for my product price comparison site. I have also received payment from them many of times. I don't use them so much now though as I had decided to reduce the number of sites I own.