And MIT get's news for fielded technology? Come on...

http://pesn.com/2005/08/11/9600147_Edison_Stirling_largest_solar/

http://www.stirlingenergy.com/

A cover article in Popular Mechanics (or Science) over thirty years ago showed a parabolic reflector supplying heat to a Stirling cycle engine to generate electricity. They pointed out that it was at least twice as efficient as photovoltaics. Some day, someone might catch on.

They claim there innovation is bending flat mirror's onto a frame instead of buying curved ones. Using square sections is far cheaper and simpler to build and achieves the same solar reflection if well aimed, I have no idea why this got a patent, funding or news coverage. It is no more efficient than existing 10 year+ old designs which I have built from scrap with one assistant. They also haven't even got motor powered sun tracking yet! A level students could do better than this with 20 mins looking for plans on google, come on MIT make something amazing!

Isn't there already one of these in Seville?

These guys are doing something similar - except focusing the light onto PV's.

http://www.solarsystems.com.au

They are also looking at using the heat to increase the efficiency of generating hydrogen.