I just read the book, and recommend it. Peter deals with big issues that we're all struggling to grasp. the notion is that the web is place which is a network of places… and how do we think about that, or get around.
Hmmm… I can see that it's hard for me to articulate this, but the book really gave me more depth into what's happening on the 'net, and also, why sites like ours work.
He ties together a lot of work from others that provides some deep insight, for example, a quote from the redoubtable Dave Weinberger, on the centrality of marketplaces to much of human experience.
You can find it on the redoubtable O'Reilly site, I useta have a lot of their work, when young, and technical.