When we launched our first iPhone application, TapDefense, we were thrilled as the number of downloads increased by the hour. We got such interesting feedback that we even set up our own Facebook group so we could learn more about our users. Everything was going better than planned. Except for one thing: we needed to find a way to make money from our very popular app. Like many other iPhone game developers, we decided that showing banner ads was a good idea, and went looking for a good ad network to work with. We quickly integrated the ad functionality into our app, and waited for the money to start rolling in. - Jeff Scott