Armageddon Online
   Notes, news and links on destructive forces of the universe from volcanoes, tsunamis, plagues and nuclear weapons on Earth to stars collapsing and exploding into hypernovae across the galaxy.
   http://www.armageddononline.org

Challenges of Nanotechnology Misuse Cited in Leslie's 'The End of the World'
   From the Foresight Institute (which specialises in nanotechnology).
   http://www.foresight.org/Updates/Update26/Update26.3.html

Exit Mundi
   A variety of apocalypses: meteors, black holes, technological disasters, weird physical phenomena, religious writings, robots, and aliens.
   http://www.xs4all.nl/~mke/exitmundi.htm

Let's Save the Future
   A critical situation, arising due to a rapid development of the natural sciences, creation of powerful means of destruction and the use of ancient, military methods of resolving conflicts, is considered.
   http://www.savefuture.net

On the Danger of the End of Civilization
   Essay by Prof. E.A. Abramyan concerning weapons of mass destruction, ecological dangers, and the need to motivate the populace.
   http://www.abramyan.ru/

Possible Future Global Catastrophes
   This survey considers earthquake, pandemic, alien aggression, interplanetary impact, supernova, ice age, nuclear catastrophe, bioterror, and nanotech robot aggression.
   http://humanknowledge.net/SocialScience/Futurology/Catastrophes.html

TerraMortis
   News blog covering possible doomsdays due to disease, nuclear mishap, earthquakes, asteroids, global warming, poleshifts, nuclear war and supernovae.
   http://terramortis.com/

WWW Bomb Shelter
   Virtual "bomb shelter," based on instructions from Soviet Union Cold-War-era pamphlets, offers information on preparing for nuclear attacks, as well as histories and descriptions of various nuclear weapons.
   http://ycrop.com/bombshelter/