Someone mentioned a "post-economic society" in the Uncle Sam's new toy thread, one where everything is done by robots. I think "post-economic" is probably a bad descriptor, because there would still be the economics of supply and all -- it would just be done by robots. But it's the sort of society we can conceive of, because our robots are getting better and better. Of course there are two elements besides robot labor needed to get there, namely unlimited energy and unlimited resources. The first is nowhere in sight; the second is, via asteroid mining, at least for metals.
Some questions I thought it would be interesting to ponder:
How would the transition to a robotic society/economy happen?
Would a robotic society/economy be a good thing?
With everything done by robots, what would humans do?
The first one may be the most critical, since the most effective and versatile robots at the moment are owned by corporations, and I can't see them letting go so robots can make things for everyone for free. I'll forbear commenting on other aspects, for the moment.