Planet Plots: Going to Mars, Grasshopper!: Elon Musk's keynote address. In the second video, he discusses the need for a fully reusable, fast turnaround spacecraft. That's as much as I had time to watch. I'll watch more later.
Interesting that he doesn't want to mine anything and bring it back to Earth. Well, if access to space gets cheap enough, you should be able to do that. Sure, there's plenty of stuff on Earth, but there's resistance to mining on Earth. Why not mine a dead, lifeless heavenly body, and be able to use it to benefit people on Earth? You need an economic basis for it, and, although that probably doesn't work economically now, it may work in a future time.
Update:
Some interesting questions and discussion from the audience
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