Well, apparently (incredibly expensive) commercial space flights will be avilable within a decade or two.
The fear of nanotechnology is that people think it means little robots that reproduce, and to reproduce they need a food source. Of course, whoever programs these things won't have ever heard of Asimov and little robots will eat us all.
As for nuclear power, I think the main problem people have is that each plant can only really last for 40 or so years, then needs to be deconstructed, which costs lots and takes 30 years or something.
Personally, I'm looking forward to (ITER?) the experimental fusion reactor being built in France.
"Beer is the mind killer. Beer is the little death that brings total obliteration. I will face my beer. I will permit it to pass over me and through me, and when it has gone past I will turn the inner eye to see its path. When the beer has gone there will be nothing. Only I will remain."
Make beer, not war.