Part 10 from Andrea Boschin's article series on Windows 8 Metro is already published at SilverlightShow.
From the author:
Animations and mostly transitions are something that may change drastically how your application looks to the end user. This is true twice in a touch enabled application where the usual strategies for giving feedback to the user, about its interaction with UI elements, are not really effective.
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.