Can't help but add Socrates' comments to Phaedrus in the Plato's dialogue Phaedrus (around section 274), to the effect that writing destroys man's faculty of memory, and bestows only a superficial sort of learning. As Socrates relates it, the Egyptian god Theuth describes various inventions to the king Thamus: "But when they came to letters, This, said Theuth, will make the Egyptians wiser and give them better memori…
Somewhat OT, but this seems to apply very well to the effect of Google on many of us too. While this originally referred simply to the 'availability' of knowledge in external sources, with Google (and the Internet as a whole) it becomes 'easy accessibility', which is perhaps even more dangerous. Dangerous unless we make conscious effort to avoid this phenomenon and use the technology for our enrichment.