Linux

• Debian - my preferred Linux distribution- combines an excellent package management system with some well considered policies on software licences and non-free software.
• Free Software Foundation - the home of the GPL and the originators of the Free Software movement. The place to go for a whole suite of utilities which will ease the use and administration of any Unix.
• Linux Weekly News - a very useful Linux news site.
• Freshmeat
• Slashdot
• Linux.com
• Linux Documentation Project
• Plugger - Multimedia plugin for Netscape on Unix which provides support for Quicktime, MPEG, AVI, etc.
• linux.org.uk
• Ogg Vorbis - MP3 Replacement
• Parsec - 3D shoot-em-up for Linux
• Linux Performance Tuning
• Advogato - Home to diaries of many of the key developers and protagonists of the free software movement. Also interesting exercise in group trust metrics (though I'm still not sure whether it's as scalable as claimed).
• Linux ATA Development

Humour

• Dilbert
• User Friendly
• Unitechnology - A Company You Can Believe In?
• The Bastard Operator From Hell - The Complete WWW Edition

Cambridge

• ATT Research Labs Interesting Pages - Including a Cambridge panorama web-cam and live readings of Cambridge weather from the roof of the building. (Oh, and another coffee machine)
• Cambridge University
• Trinity Hall - The best of the Cambridge Colleges?
• Cambridge Pubs - ... it would seem we're not short of them

Miscellaneous

• Currency Convertor
• Ordnance Survey Maps of the UK
• More online maps of the UK
• The Microship Project
• fuckedcompany.com - News and rumours of companies on the edge of the abyss...
• The Doomsday Algorithm - How to work what day of the week any date is (in your head...)

Computing (General)

• Netcraft - Home of the most comprehensive webserver survey available.
• Zeus Technology - purveyors of exceedingly fast webservers since 1995.
• Gyre Technology - a Unix consultancy/software company
• Exim - A very powerful MTA from Cambridge University
• Domain Name Buyer's Guide - A survey of the various Domain Name registrars- well worth a look if you're considering buying a domain.
• Free On Line Dictionary Of Computing
• The Jargon File
• Unix Guide - Comparison of commands across several major Unices. (Useful for answering questions like "What's the equivalent of 'strace' on Solaris?")
• Unix Socket FAQ
• Cyc - Possibly the closest yet anyone has to got to an AI. Certainly a company to keep your eye on.

Truly miscellaneous miscellany

• Mark Sweeting's home page - Description...? better not.
• Undue Org - Matt Kern's homepage, useful mostly for xpilot fans.
• Firestick - Colin Stephen's home page (in need of some considerable work ;-) ).
• Useful Latin Phrases
• Martin Keegan - God forbid that MI6 ever recruit this man

News

• CNet News - A general computing news site
• The Register - irreverent news site, and current home of the BOFH archives.
• The Standard - "Intelligence for the internet economy"? hmmm. Well- a few useful articles at least.
• Red Herring - Tech Industry analysts

Freedoms, privacy and the law

• Electronic Frontier Foundation
• Cryptome - "Cryptome welcomes documents for publication that are prohibited by governments worldwide, in particular material on cryptology, dual-use technologies, national security and intelligence -- open, secret and classified documents -- but not limited to those."
• Guerilla.net
• Software Patent Working Group of the FFII - Invaluable (and comprehensive) resources, articles and links related to the European software patent debate
• Alternative Dispute Resolution Services Ltd - Arbitration services - a faster, cheaper alternative to all out war in the courts.

Iain M Banks

• www.phlebas.com - Nice site, with some interviews with Iain, reviews, et al.
• http://www.marathon.org/story/halo_culture.html - Included mostly out of curiousity- this site examines the similarities between the computer game 'Marathon' and Banks' science fiction novels.
• Excession - Some interesting ray traced images of ships/places in the Culture Novels

Security

• Security Focus - - home of BUGTRAQ- many useful resources
• CERT
• Rootshell.com - Exploits galore. Worth visiting, if only to scare yourself into taking security seriously.
• Nessus - A security scanner
• Insecure.org
• The Abacus Project - Useful set of utilities for intrusion prevention, including a log monitor and port scan detector, amongst others