It isn't hypertext, but it's books that Borges could've written, but didn't. Yeah.

http://www.themodernword.com/borges/borges_hexagon.html

He also had this to say about making up books:
The composition of vast books is a laborious and impoverishing extravagance. To go on for five hundred pages developing an idea whose perfect oral exposition is possible in a few minutes! A better course of procedure is to pretend that these books already exist, and then to offer a resume, a commentary . . . More reasonable, more inept, more indolent, I have preferred to write notes upon imaginary books.
-- 10 November 1941