With the release of Windows 8 Consumer Preview last week the path is open for developers and designers to start building Windows 8 Metro style apps. Partly for myself but hopefully useful for you too: I gathered a list of official (technical and developer) blogs to add to your RSS reader.

Engineering Windows 8 Blog (B8): http://blogs.msdn.com/b/b8/ (RSS)
An inside look from the Windows engineering team

Windows 8 app developer blog: http://blogs.msdn.com/b/windowsappdev/ (RSS)
Insights on building Metro style apps for Windows 8, by the Windows 8 engineering team

Windows Store for developers: http://blogs.msdn.com/b/windowsstore/ (RSS)

For developing Metro style apps the following are also recommended blogs:

BlendInsider: http://blendinsider.com/
The Microsoft Expression Blend team blog

The Visual Studio Team Blog: http://blogs.msdn.com/b/visualstudio/

IE Team Blog: http://blogs.msdn.com/b/ie/
The Internet Explorer blog, insightful and in-depth articles on IE internals, and HTML5, JavaScript…