Technology Review: Blogs: arXiv blog: How to narrow the search for ET
An Israeli researcher has a suggestion for how to reduce the number of stars to investigate in the search for extra-terrestrial life: look at stars that could detect us. Specifically, he suggests that select stars that could detect the planets of our sun using means that we already use, such as brightness changes as the planets of the solar system pass in front of the sun. This means that only stars along a narrow angle of the ecliptic would be considered, and if Earth-like worlds were discovered there then there would be a good chance they might have detected us.