Google today announced wider testing of AdSense for Mobile Applications, a new service that allows developers to earn money by displaying text and image ads on their Apple iPhone and Android apps.

When creating an application, developers can insert an associated snippet of code that will allow the iPhone and Android-powered handsets to display the ads. This code works to sync the application to Google's (NASDAQ: GOOG) ad network, essentially bringing developers' apps into the fold of Google's content network, a Google spokesman told InternetNews.com.

The new service gives developers the ability to pick where the ad is displayed on the screen and to target certain demographics -- in much the same way traditional AdSense works for Web publishers, who can place AdSense ads on their site.

Google had been testing AdSense for Mobile Applications with a small number of partners, including restaurant finder Urbanspoon, game maker Sega and online music search firm Shazam, and is now opening up beta testing to other developers who meet specific criteria.

Get the full story here at InternetNews.com.