Part 11 from Andrea Boschin's article series on Windows 8 Metro is already published at SilverlightShow.
From the author:
Windows 8 and the so-called metro-style interface, fully embraces and empowers the paradigm of tiles, replacing the old start menu with a start screen that make room to a wide number of tiles, especially targeted to the needs of the RT version of the operating system but equally present in the full version. One of the extension of the tile system in Windows 8 are badges, a parallel and tangent system that slightly intersects the tiles presenting special notifications on its surface, but that may also work on the main lock screen.
The whole series will gradually be published into a multi-part ebook.
Part 1, including the first 7 chapters from the series, is already available on
SilverlightShow Ebook Shelf.