Drik Schulze-Makuch and Paul Davies, both university professors, published an article in the Nov. Journal of Cosmology wherein they put forth the idea that one-way colonizing missions to Mars should be considered by some private investors.
Their reasoning is that the cost of the trip to Mars could be cut by as much as 80% by not taking extra fuel and provisions for the return trip. They also suggest that these missions be undertaken, at least initially, by people in their 60's. These sexagenarians would make the 6 month trip to Mars in space craft which could double as living quarters once they reach the planet.
The two feel there is some urgency for humanity to colonize space, in this article the idea of a hedge against disaster is cited.