Yesterday, Google announced the Google Analytics for Mobile Apps. What this adds, is the ability for you to track how your users are using your Mobile App.
Analytics for Mobile Apps SDK is currently available for Android and iPhone use. The SDK currently tracks Events and Page Views.
The major downside to this type of tracking and currently all usage tracking methods, is the requirement of an Internet Connection. The connection is needed to upload the data to the Google Analytics servers for your research. The SDK will continue to track usage, but it will not be able to upload any data without a connection. This means, WIFI on an iPod Touch or either 3G or Edge on an iPhone or Android-based phone.
Instructions on how to add Google Analytics to your iPhone or Android app are available on the Analytics Tracking for Mobile Apps site.