Human Extinction

Beyond the Holocaust - Survival or Extinction?
Subtitled "A survival manual for humanity", this online book attempts to summarise problems threatening humanity's very survival, their causes and possible solutions to them.
http://www.hpn.org/beyond/

Book: The End of the World - The Science and Ethics of Human Extinction
by Prof. John Leslie. The first comprehensive survey of potential catastrophes speculated upon by scientists, from comet and asteroid impacts to nuclear or chemical warfare, from ozone layer destruction to overpopulation and poisoning of the environment or the risk of disaster through genetic engineering. Also covers philosophy and ethics. 1996
http://www.amazon.com/exec/obidos/ASIN/0415184479

Existential Risks
Paper by Nick Bostrom, analyzing well-known and less well-known extinction risks and related crippling hazards to humanity.
http://www.nickbostrom.com/existential/risks.html

The Future Watch
The site intended to prevent the cataclysmic end-of-the-world scenarios caused by advancing technology. Articles, news and media references.
http://www.thefuturewatch.com/

Musing on Beginning and End
Thoughts on the enormity of the cosmos and the life cycle of civilizations, including our own.
http://www.rationallink.org/beginend.htm

Remarks on the Doomsday Argument
Questions if people are underestimating the likelihood of human extinction in the next few decades, a position put forward by the philosophical Carter-Leslie doomsday argument. Highly philosophical and statistical.
http://www.anthropic-principle.com/preprints/inv/investigations.html

The Universal Extinction Constant
The site author, Alan J Bessant, introduces his thesis and promotes understanding of the Universal Extinction Constant and Extinction Threat Level.
http://www.extinctionthreat.com

Salon - X Stands for Extinction
A physician warns that humans could go the way of the dinosaurs if they don't face up to the threat of killer viruses. <small>(March, 1997)</small>
http://www.salonmagazine.com/march97/news/news2970321.html