Meanwhile, SpaceX is working on making their F9 first stage land on Earth under its own power. Very cool, and a nice cost saver if they get it working, but maybe not super-revolutionary.
Put those thoughts together, though, and it looks like the system used for landing the F9 would be very useful for landing a heavy shipment on Mars, and it would have already been proven on Earth.
>> "In June 2013, Musk stated that he intends to hold off any potential IPO of SpaceX shares on the stock market until after the "Mars Colonial Transporter is flying regularly."
I've been hoping to get in on a SpaceX IPO for some time now. Looks like I'll be waiting a few more years... =/