The Drake Equation
- Describes the famous formula for estimating the number and character of alien civilizations within the galaxy. Includes an online form that calculates your numbers.
- http://www.seti.org/seti/seti-science/

The Fermi Paradox
- Introductory articles on the theory.
- http://www.fermisparadox.com/

Wikipedia - Fermi Paradox
- Encyclopedia article summarizing the concept.
- http://en.wikipedia.org/wiki/Fermi_paradox

UFO Evidence : Fermi's Paradox
- Links to articles and documents explaining or discussing the paradox.
- http://www.ufoevidence.org/topics/Fermi.htm

Fermi's Paradox
- Lecture notes from a college cosmology course.
- http://zebu.uoregon.edu/~js/cosmo/lectures/lec28.html

Fermi's Paradox II: What's Blocking Galactic Civilization? Or Are We Just Blind To It?
- Article asking, "Could galactic empires exist?" and "What is keeping advanced extraterrestrials from claiming every star system in sight?"
- http://www.space.com/searchforlife/shostak_fermi2_011108.html

The Possibilities of FTL: Or Fermi's Paradox Reconsidered
- Discusses some of the logic behind arguments for and against humans being alone in the universe.
- http://www-personal.engin.umich.edu/~fritx/Ftlessay/essay.html

A Wild Hypothesis
- Essay on the development of civilizations.
- http://www.stampe.nu/wild/

I.T. seeks E.T.
- Discusses the Allen Telescope Array (ATA) scheduled to be completed by 2005 and the search for extraterrestial life as it related to Fermi's Paradox and the Drake Equation.
- http://astronomy.swin.edu.au/staff/gmackie/Fermi_Drake.html

Fermi's Paradox, The Great Silence, and The Singularity
- Long article discussing the implications of what is known so far about other life in the universe.
- http://www.asi.org/adb/06/09/03/02/108/fermi-singularity.html

Fermi Paradox/Drake Equation
- Drake's equation attempts to estimate the number N of currently extant civilizations in our galaxy that would be able to contact each other.
- http://www.newton.dep.anl.gov/askasci/phy99/phy99024.htm

Debate Topic: Fermi's Paradox
- A couple of possible resolutions to the question of galactic colonization.
- http://www.phys.unsw.edu.au/astro/seti/dt/fermi.html

Fermi's Paradox and the Preparation for Contact Hypothesis
- Suggests that aliens might be "preparing" mankind for the eventuality of meeting species from other worlds.
- http://www.ufoskeptic.org/contact.html

Our Galaxy Should Be Teeming With Civilizations, But Where Are They?
- Article discussing Fermi's Paradox and its implications.
- http://www.space.com/searchforlife/shostak_paradox_011024.html