Xanadu: The Forgotten Hypertext
wikinerd writes "Xanadu, a project started in the 1960s to create a deep-linked hypertext infrastructure with xanalogical structures, is still alive, although largely forgotten due to the emergence of the Web."
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Google Cache works just fine.
For those afraid to click: http://64.233.167.104/search?q=cache:gy9PbZ-8NicJ
Pain lasts, kid. Its how you know you're alive. Sometimes I think this growing up thing is just pain management-TheMaxx
There's been a fair bit of discussion about this for vim 7. You might want to grab the .ogg file from vim.org and start reading the vim-dev archives.
Incidentally, it's nothing like O(2^n). Space proportional to the number of changes made is perfectly doable...