When you build a site with an aim to make money, you want to use multiple ad networks so that you can maximize your earning potential. Even Bizdustry uses two ad networks adsense and infolinks. I don't have a site but onve I launch my blog I would be looking for multiple ad partners. So, I am asking the community to share experience of using multiple ad networks? What kind of ad networks you are using and which ad network is earning you most?