I was looking for a practical book to discuss with members of my department during department meetings and I think that this will help shake things up a bit.
Although there are a lot of activities in this book, it is not the kind of book you might open Sunday night to figure out "what am I going to do tomorrow". And that is a good thing. Read this from front to back (old-fashioned linear reading) and Blaz does a good job at presenting what differentiated instruction might look like in your language classroom, and also plenty of hints on how to slowly make the transition.
There is a chapter in the end that she calls "ideas smorgasbord" where she presents different activities that lend themselves to differentiated instruction and, best of all, she arranges them by level and by the amount of preparation required.
This is a great addition to a professional library for teachers of a second language.