When the first self-published edition came out in 1974, Ted Nelson's two-sided classic about the current and wished-for state of computers-as-cultural-tool had the memetic impact of a big ol' 2 x 4 to the forehead on the few who read it.
In an era when IBM dominated the industry, and the best most social critics could come up with vis-a-vis computers was an incoherent babble about punch cards and Big Brother, it revealed a side of computing few had seen, and dared to dream about knowledge-sharing networks and graphic interfaces.
In 1989, I bought two dozen copies of this book (Microsoft Press edition). I gave some copies to friends, but most went to my co-workers at a small home-PC company. It was a coolness test. People who talked about it, who GOT it, I had hope for. Those who didn't get it, or scoffed, I marked as duffers. Alas, this included many of the company's higher ups.
Why only four stars for what was once an utterly invaluable tome, a source of inspiration, a shining literary beacon of hope? Mostly because much of what Computer Lib / Dream Machines advocated has come to pass (albeit in ways that Nelson would probably not prefer). Partially because the battle to complete the job has moved into other spheres: Legal, commercial, and the nitty-gritty work of actual product creation.
If you see a copy, or either edition, BUY IT.