Windows 8
Websites
Getting started with Windows Store Apps
Tools
Requires Visual Studio 2012 Express for Windows 8 and related tools and resources which are available as a single SDK download. Windows Azure is recommended.
Visual Studio:
Other
They have app samples: http://code.msdn.microsoft.com/windowsapps
They have templates: http://msdn.microsoft.com/en-us/library/windows/apps/hh738343.aspx
They have developer camps: http://www.devcamps.ms/windows