The excellent FiveBooks site interviewed me recently, and asked me to recommend five books to read about artificial intelligence. I think this is the century of two singularities, so I chose two books about the Technological Singularity (one each by Kurzweil and Bostrom) and two about what I call the Economic Singularity, the consequences of technological unemployment (one by Martin Ford and the other by McAfee and Brynjolfsson).
The interview (here), by Sophie Roell, is quite long, but a jolly good read (in my wholly un-biased opinion).
My fifth book choice is Permutation City by my favourite science fiction writer, Greg Egan. I don’t know anyone else who deals with the implications of strong AI better than Egan.