Catastrophism … www.pibburns.com/catastro.html (Philip Burns)
Cosmopier … http://sites.google.com/site/cosmopier/ .. which has some interesting ideas on End of Pleistocene and environmental change
www.catastrophism.com … Ian Tresman's site. Lots to interest all and a high spec CD to boot (also available from the SIS Book Service)
Impact Earth … www.purdue.edu/ImpactEarth (Pierazzo and Collins)
Cosmochemistry … www.higp.hawaii.edu/cosmoeye (space science)
see also www.psrd.hawaii.edu
Bob Kobres … http://abob.libs.uga.edu/bobk/cbaymenu.html
Near Earth Asteroids … www.iau.org/public/neo/
http://massextinction.princeton.edu
www.qconference-athens-2011.grazian-archive.com
To be updated in due course