In this Windows Phone post, René Schulte demonstrates how to determine the memory usage of your application.
Source: Kodierer [Coder]
The final Windows Phone Developer Tools have been released and the launch date is not far away. It's time to finalize the apps.
Windows Phone has some tough hardware requirements, but it's still a mobile platform with limited resources. In this blog post I'll describe how to determine the current memory usage, what the allowed maximum is to get your app approved for the Marketplace and other constraints a developer should be aware of.