In 1974, Arthur C. Clarke Predicted the 2001 Internet

Not just as a vague concept, either. The famed science fiction author absolutely nails it, from the bank statements to the hardware to the social changes to the possibilities for communication.

"Visionary" is an awful, over-used word, but it's cases like this which are the rare exceptions you can actually use it and it fits.

Arthur C. Clarke Predicts the Internet & PC [YouTube, via Neatorama]