The patterns & practices team (http://msdn.microsoft.com/practices) is exploring the space of application development for Windows App Store and Windows 8. We are thinking about lean reusable components that help address common cross-cutting concerns. For Windows Store apps, the candidates are logging, user data validation, transient fault handling, data caching and potentially others. If you are building or planning on building this type of apps, please engage with us and help us understand your logging scenarios.