If you are creating a new application, you probably want to use the new Google Analytics SDK for Windows 8 and Windows Phone . Google recently posted a big update for GA and added all sorts of exciting features specifically for apps (against websites). Along with this change, they abandoned the old UTM protocol and now require a newer measurement protocol for all applications. AFAIK, this SDK is the only one that supports the new measurement protocol, thereby being the only one that works with the new features of the GA mobile application. Note: you can still use these other SDKs with existing GA properties or spoof GA, believing that the application is a website, providing a verified domain name.
Full disclosure: I wrote this SDK and created it for this very reason. It supports Win8 JS, Win8 Xaml, WP7 and WP8.
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