Sites

Panspermia Revisited (Popularity: )
http://arxiv.org/abs/astro-ph/9909013
Short scientific article by John R. Gribbin. "Spreading of life-bearing spores across the Galaxy (panspermia) may be easier than is usually acknowledged."

Cosmic Ancestry: The Modern Version of Panspermia (Popularity: )
http://www.panspermia.org/
The Cosmic Ancestry hypothesis - about which this site has a large amount of information - treats all of evolution, not just the origin of life on Earth, as due ...

Panspermia (Popularity: )
http://www.daviddarling.info/encyclopedia/P/panspermia.html
Descriptive entry in The Encyclopedia of Astrobiology, Astronomy, and Spaceflight.

Panspermia: Society for Life in Space (SOLIS) Society (Popularity: )
http://www.panspermia-society.com/
Panspermia overview and technical papers.

Are We All Aliens? The New Case for Panspermia (Popularity: )
http://www.space.com/searchforlife/aliens_all_001027-1.html
Interviews with experts on panspermia and in other fields shows rising interest in the idea.

Cosmic Ancestry: The Modern Version of Panspermia (Popularity: )
http://www.iscid.org/brig-klyce-chat.php
Transcript to an online chat with panspermia theorist Brig Klyce.