We have recently developed an AdSense App for iPhones. To get started we would like to give out a few promo codes which you can use to try the app. The goal was to develop something that both tracks and helps with optimization. You can track CTR and PPC, all in detail .
What you have to do is open this link, and enter the promo code. The link will open up your iTunes promo code page. This only works for American visitors though (restriction by Apple).
For some more information about the App please check here. If you want an additional promo code in case the ones up there have been used by others let me know.