PSRD's take on this subject
Announcement from Planetary Science Research Discoveries [PSRD]
http://www.psrd.hawaii.edu
New Article :: Martian Meteorites Record Surface Temperatures on Mars
--- Gases trapped in Martian meteorites indicate that Mars has been a cold desert for a long, long time.
Full story and a PDF link at: http://www.psrd.hawaii.edu/July05/Mars_paleotemp.html
