Vannevar Bush, the engineer who designed the world's most powerful analog computer, predicted the development of a new kind of computing machine he called Memex. For many computer and information scientists, Bush's Memex has been the prototype for a machine to help people think. This book contains Bush's essays, and original essays by academic and commerical researchers relating the state of art in personal computing, hypertext and information retrieval software to bush's ideas and Memex.