Tapstream App Banners shows your iOS visitors a sweet app or game (using Safari's Smart App Banner). You get paid for every impression.
If you're using the WordPress or other third-party plugin for mobile website support, you should get this plugin. It's a great way to make money using really high-quality looking banners (just like Apple's Smart Banners) by advertising apps to users. And it will only show iOS apps to iOS users (and not to Android users).
I hope they make a version for Android & Google Play to monetize that traffic too.