Cheap, Simple, Small, Safe Nuclear Power...

Molten-salt fission reactor technology sounds compelling to me, the more so every new time I read about it.  In a rational world (that would be some other planet, most likely in some other space-time continuum), environmentalists would be demanding the use of technology like this in place of coal- or gas-fired electrical generation.  I've only seen them railing in mostly mindless opposition, though...