Here's a Windows Store App to help you write Windows Store Apps..
Here's an app which I wanted to make for a while. Answer a few questions, and the app will create a personalized list of links into MSDN and other sources to help you with your Windows 8.1 App.
I've tried to find the key links to get you pointed in the right direction.
This is definitely a v1 release, so please feel free with the feedback!
Here's the link: SmartBook for Windows App Store Development.