Glossary of Astrobiology Terms:
http://www.aao.gov.au/local/www/jab/astrobiology/glossary.html

PhRMA Genomics Lexicon:
http://science.bio.org

Lipid Biomarkers:
http://www-odp.tamu.edu/publications/175_SR/chap_10/c10_f4.htm#609214

NASA Astrobiology Institute homepage:
http://nai.arc.nasa.gov/
     (where you can "Ask an Astrobiologist" and find recent science news in the field of Astrobiology)

Life in Extreme Environments Information Page http://www.astrobiology.com/extreme.html

The award-winning site of Astrobiology at NASA-Ames
http://astrobiology.arc.nasa.gov/
   (where you can check out the Astrobiology Magazine on this homepage)

The Astrobiology Web:
http://www.astrobiology.com/
   (also contains the SpaceRef dictionary and links to other dictionaries)

The journal Astrobiology

http://www.liebertpub.com/AST/default1.asp

Simulation of Impact that Formed Moon
http://www.swri.edu/press/impact.htm
  "SwRI, UCSC researchers identify the Moon-forming impact"

The Origin of the Moon: The Movie
http://yso.mtk.nao.ac.jp/~kokubo/moon/kit/movie.html
  (You may just enjoy this for the entertainment value.  The Japanese really know how to make cool simulations.)

Martian Meteorite http://www.biophysics.uwa.edu.au/STAWA/TEM_images.html

Mars Orbital Camera Pics
http://mars.jpl.nasa.gov/mgs/msss/camera/images/index.html

Earth and Moon Viewer
http://www.fourmilab.ch/earthview/

The Geology Club
http://epsc.wustl.edu/geologyclub/index.html
   ( A group of rocks. What? No! It's a group of people interested in rocks!  The main draw are the fieldtrips.)

Research Opportunities for Undergraduates http://epsc.wustl.edu/admin/research/undergrad/index.html
    (What are your fellow undergraduates doing?  Would you like to participate?)

Permian Extinction:
http://palaeo.gly.bris.ac.uk/Palaeofiles/Permian/SiberianTraps.html
http://palaeo.gly.bris.ac.uk/Palaeofiles/Permian/Map.html

Magentotactic Bacteria

Information: http://www.biophysics.uwa.edu.au/STAWA/TEM_images.html

Movies: http://www.biophysics.uwa.edu.au/movies/mag_chem/Vin26_rt_f.mov

http://www-micro.msb.le.ac.uk/Video/Chromatium.mov

Nanobacteria

http://naturalscience.com/ns/articles/01-03/ns_folk.html

Cyanobacteria

http://www-cyanosite.bio.purdue.edu/index.html

Harold Urey:
http://www.nap.edu/html/biomems/hurey.html

Interview with Stanley Urey:
http://www.accessexcellence.org/WN/NM/miller.html