Hypertexts and proto-hypertexts

This is a thread for discussing published hypertexts and books that seem to have hypertextual qualities (you know the drill: Pale Fire, Dictionary of the Khazars, Hopscotch, etc.). If anyone has some favorites or some new discoveries for either category, feel free to post them here.

Pavic's other works also have some proto-hypertext characteristics. Landscape Painted with Tea for one.
House of Leaves by Mark Z. Danielewski is also excellent.

Jacques Derrida's Glas, which is extremely hard to come by, has a hypertextual construction. There are many parallel segments of text on the same page, with different but interlocking arguments.

There's Paul Auster's New York Trilogy.

Jorge Luis Borge's Library of Babel