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Ted Nelson wrote a book called Literary Machines in 1982 describing his Xanadu project. He develops fascinating ideas such as Tumblers, for addressing bits in files past and present, Transclusion as a method for including original work in one's own work, and Micropayments to pay for the use.
The publisher Eastgate has reprinted this book that was first printed in Nelson's own publishing house, Mindful Press.
More information on Xanadu can be found at http://www.xanadu.com.au/
