Present life on Mars all but assured by two independant findings!
http://news.independent.co.uk/world/science_medical/story.jsp?story=505454
http://news.independent.co.uk/world/science_medical/story.jsp?story=505454
Are we to bow down before the farting martians?
It seems possible. Even if life didn't evolve there, microbes from earth could have been ejected during one of the major asteroid hits, and landed on mars. I have also heard that there could be life on mars-carried there by our mars probes that were improperly sterilized.
If there isn't life there, should we engineer something to grow there and change the atmosphere?