There are numerous interesting books and articles that have been made available freely online.
This is an ever-expanding collection of links to ones that I have enjoyed.

Books

A New Kind of Science - Stephen Wolfram
Cyberia - Douglas Rushkoff
Flatland: A Romance of Many Dimensions - Edwin A. Abbott
Out of Control - Kevin Kelly
Oven-Ready Chaos - Phil Hine
Programming and Metaprogramming in the Human Biocomputer - John Lilly
The Book of Pleasure (self-love): The Psychology of Ecstasy - Austin Osman Spare
The Hacker Crackdown: Law And Disorder on the Electronic Frontier - Bruce Sterling
The Psychedelic Experience - Timothy Leary, Ralph Metzner, and Richard Alpert
The Roots of Consciousness - Jeffrey Mishlove
The Vampire Codex - Michelle Belanger

Articles and Essays

A Cyborg Manifesto: Science, Technology, and Socialist-Feminism in the Late Twentieth Century - Donna Haraway
A Mathematical Theory of Communication - Claude Shannon
Computing Machinery and Intelligence - Alan Turing
Culture Jamming: Hacking, Slashing and Sniping in the Empire of Signs - Mark Dery
Evolutionary Psychology: A Primer - Leda Cosmides & John Tooby
Man a Machine - Julien Offray de La Mettrie
Memes: The New Replicators - Richard Dawkins
Secure Deletion of Data from Magnetic and Solid-State Memory - Peter Gutmann
Techgnosis: Magic, Memory, and the Angels of Information - Erik Davis
The Rise of Cyborg Culture - David Porush
Viruses of the Mind - Richard Dawkins

In addition to these, there is another list of materials located on my Quantum Sorcery page.

Vargr
Updated 12/08/05
www.spikevision.org