Although a few years old, the issues described in this book have only become more pressing. Brin's premise is an interesting one: preserving privacy is going to become almost impossible, so our only recourse is to make sure that we know who's watching us and hold them accountable. In other words, we must be able to watch the watchers. I'm not sure he's entirely correct that we can't protect our privacy, but I think his argument that we should have reciprocal transparency is a good one (although not one to which any government will ever acquiesce).
The book itself is quite dry, and spends far too many pages belaboring his point.