Don't get me wrong, this book has a lot to offer: 500+ pages of it! But it was written in 1990 and it shows.
Almost everyone who has written a paper for this collection has some link to Macintosh (except for Timothy Leary of course). All examples are Macintosh based. And we're not talking G3's here. We're talking Mac II's.
No mention is made of the Web (how could it be?). It does, however, make a lot of good points that are applicable for all User Interface designs.
So, in general, this is a good book for it's time, but it's time has well and truly passed.