Lanier is a big thinker, and he asks his reader to follow the train of his thought, which varies pretty widely at times, though his main points include at turns arguing against the singularity (the eventuality that computers will be "smarter" than humans one day, most famously championed by Ray Kurzweil), discussing such futurists and their new religion, and of course -- taking on Web 2.0.
ENGADGET: Book Review: You Are Not a Gadget Alt