The Eerie Silence -- Dr. Paul Davies

I have been listening to the audio book version of Paul Davies book The Eerie Silence -- renewing the search for alien intelligence. Davies is the well known British physicist and astrobiologist who is a professor at Arizona State University. He is the chair of SETI's Postdetection Taskgroup. This book gives an evaluation of SETI after 50 years and ideas for a "new SETI" -- different ways to search for other life forms. One of the most interesting ideas is the realization that if Earth's environment is conducive to the biogenisis of life, then life should have arisen several times on Earth. Finding a different biogenisis of life on Earth would say a lot about the likelihood that life would arise on other Earth-like planets.

I strongly recommend The Eerie Silence.