It’s a brand new world for chess books. 
Many chessbooks could do really well with that sort of interactive format.
I’ve looked at ebooks, and the way chessbase or chessbase reader does them, they tend to come across more like heavily annotated games and game pieces, rather than an ebook.
The Everyman ebooks using chessbase reader or chessbase database are quite functional, but improvement always comes as technology advances.
Sweet, Jeremy Silman’s “Complete Endgame Course” is going to be done in that. I"ll have to put that in my "to buy list.
I hope Silman also does “Reasses Your Chess” on it also. That would totally rock.
I went through “Reasses Your Chess” a few years ago, and was thinking it was chock full of great stuff, but nowadays, its too time consuming to study chess with normal books and setting game and game fragments over and over.
One book that REALLY could use that format is Fine’s Basic Chess Endings.
It’s worth test-driving just for the free copy of Chess Fundamentals. The player is very impressive: you can keep book & board in synch, and you can try your own variations.
The Silman book is out: some audio clips included!