NASA's Origins Program
Science - Project Phoenix background
SETI Frequently Asked Questions
SETI Institute
SETI The Search for Extraterrestrial Intelligence
SETI@home Search for Extraterrestrial Intelligence at Home
Sky and Telescope - Resources - SETI Searching for Life
The SETI League Searching for Extra-Terrestrial Intelligence
Cosmic Search Vol. 1, No. 2 - The Quest for Extraterrestrial Intelligence