In a word, wow.
In more than a word, this was a great read, full of nostalgia, awesome geek humor, clever puzzles, and a ripping great story.
I finished reading OtherLand, by Tad Williams just a few weeks ago, and their interpretations of what VR/CyberSpace look like are very similar - perhaps because it's what it'll end up looking like some day. But their storytelling is very, very different.
@erniecline's view of what the world will be in just a few short years is pretty chilling - again, because it seems so likely.
Recommended. Buy it here.