Architecture professor Michael Benedikt was one of the first to explore the boundless architectural space that constitutes cyberspace and subsumes it. This book, edited by Benedkit, with contribution by people like William Gibson, Marcos Novak and David Tomas, is probably one of the first of it's kind. An early 90's thoroughly academic look at the potentialities of digital space and a digital environment. It is a collection of articles from a period still engulfed with the new-agey Mondo 2000 outlook on the "information superhighway".
Though it certainly isn't as popular as it used to be, and all the rash enthusiasm and transhumanist neologism-happy optimism aside, I, for one, have not given up on Gibson's cyberspace one day emerging from what we today call the internet.

Articles I particularly liked include:
* Old Rituals for New Space: Rites de Passage and William Gibson's Cultural Model of Cyberspace by David Tomas
* Liquid Architectures in Cyberspace by Marcos Novak
* Cyberspace: Some proposals by Michael Benedikt

Recommended for architects, cyberpunks, cultural theorists, computer-science historians and people who actually played MUDs, phreaked into pbxes or dreamed they lived in the sprawl at some point in their lives.