IEEE Spectrum on Mars
Over the last month IEEE Spectrum have been doing a special on "Why Mars, Why Now"
They don't seem to have a permanent home for all the articles, so here are a few links in case some disappear:
http://spectrum.ieee.org/mars (actually returns a 404 error, but this link was found on an IEEE page and was redirected to previous link. Maybe they intend to make a new page with this link in the future.)
I'm putting their spaceflight section in the sidebar links.