I just got something in the mail from a company called HUVCO that I think is pretty amazing.  The brochure is for a fiber optic skylight.  I have no idea what these cost, but each panel has 64 computer controlled Fresnel lenses that track the sun’s movement.  The lenses focus the sunlight into individual optical fibers.  The individual optical fibers combine to form four fiber optic cables.  Each 6mm cable can be run up to 60 feet.  The cables are used to light individual fixtures as well as larger fixtures with multiple cables.  There are hybrid fixtures that combine natural light and electric light in one fixture for cloudy days and night time use.  Here are a couple of videos that show the product in action.