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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
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/site/pp.asp?c=ktJ2J9MMIsE&b=179073
Wikipedia - Fermi Paradox
Encyclopedia article summarizing the concept.
http://en.wikipedia.org/wiki/Fermi_paradox