Here's a well-produced website that explores one model of settling Mars, with videos and slick graphics.
http://www.makemarshome.com
Edit... since first posting this I've tried out some of the simulations on this site. Be prepared for a difficult ride: the control doesn't seem to work well, making it hard to complete some tasks. Also don't expect total realism... they are using an image of a SpaceX Falcon 9 or Grasshopper rocket for the Mars landing simulation, for example. But oh well, it's free. No complaints!
http://www.makemarshome.com
Edit... since first posting this I've tried out some of the simulations on this site. Be prepared for a difficult ride: the control doesn't seem to work well, making it hard to complete some tasks. Also don't expect total realism... they are using an image of a SpaceX Falcon 9 or Grasshopper rocket for the Mars landing simulation, for example. But oh well, it's free. No complaints!