Venture Beat noticed that the Urbanspoon iPhone app has what looks like Google AdSense ads on them. I immediately downloaded the Urbanspoon app and went to a restaurant review and saw a similar ad. Here is a screen capture:
I would not be surprised if Google was testing some type of ad platform that works in mobile Safari and iPhone apps. It does appear that the Urbanspoon review pages are using mobile Safari. So technically, it isn’t necessarily an ad in an iPhone app, but an ad in mobile Safari. That being said, ads in mobile Safari would be easier to integrate for developers.
I have emailed Google for a comment about this and I will update this story when I hear more information.
What happens when you click on the ad? You are taken to a mobile version of the Pizza Hut site: