ScienceDirectory.info is a leading science website including agriculture, metrology, industrial engineering, earth sciences, geography, mathematic, aquaculture, aerospace and more.
Search for ET!
Interactive Flash tutorial exploring the possibility of and search for life on other worlds.
http://jvsc.jst.go.jp/universe/et_e/index_e.htm
The Planetary Society
A nonprofit organization devoted to the exploration of the solar system and the search for extraterrestrial life.
http://www.planetary.org/