Part 12 from Andrea Boschin's article series on Windows 8 Metro is already published at SilverlightShow.
From the author:
In the previous number of this series I discussed about Tiles. I’ve introduced how you can configure your own application’s tile, both primary and secondary and then I’ve slightly touched the notification topic that allows to make the tile dynamic in the content allowing the application to share information on its surface. This is an useful feature that comes directly from the Windows Phone 7, with the addition of a number of options, sizes and templates, but at the very base, the concept is almost the same.
Windows 8 make a number of step forward on this way. As I will explain during the article, your notifications on the tile are powered once more by a new and interesting tool called “badge”, but the concept of notification about tiles and badges goes outside of the tile perimeter to pervade the important surface of the lock-screen.
NOTE: 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.