Quite rightly Paul Snively backlashes against the backlashed Ted Nelson:

The thing that always strikes me about the backlash against Nelson is that no one is willing to address his points about the disparity between the Web and Xanadu. No one has the intellectual honesty to examine the materials that Nelson has made available whether it's in the form of writing, such as Computer Lib/Dream Machines, or in the form of the Xanadu Green or Gold code or the ZigZag codand explain why Nelson's specific architectural vision is wrong. All of the attacks are ad hominem in nature.

Ted Nelson used to be visiting professor in the Department of Information Science at Strathclyde. I remember his inaugural lecture at the university. A very interesting guy. I seem to recall thinking during his lecture that the concepts in Project Xanadu were well ahead of their time but I couldn't imagine they'd ever make it into a real implementation.