In this post, Karl Erickson goes into detail in the areas of Windows Phone 7 navigation structure, tombstoning, and data loading, and provides some tips to help you avoid common problems.
Source: MSDN Blogs
When you start learning a new platform, the documentation can only take you so far. The Windows Phone 7 docs are great, but when you start developing your first application, you will inevitably run into issues that the documentation doesn't cover. We are creating the Fuel Tracker guidance application to help people through this process. The idea is to address some of the most common issues that come up for all applications.