Solar Concentrator Links
Elianto in Italy and Ausra in Australia are using a very smart-looking design that is basically a parabolic trough with fresnel effect, but the receiver is kept stationary like a tower. Only 1 axis needs to be turned to control all mirrors and they can be geared together so that only 1 motor is required. Allows mirrors to stay close to ground. Serious drawback: long focal length requires very accurate parabolic mirrors. At 0:40, Elianto shows a detail of the receiver.
Saracon Parabolic Trough: low-temp steam for cooking for 15 to 30 people.
PRACTICA Foundation "Smart Tech Against Poverty" has a parabolic dish and parabolic trough design for producing steam to drive micro steam engines for pumping water:
Alterner Solar with a large steam solar collector:
Dr Reddy at IIT Madras with 2 Solar steam designs and has worked on optimizing the receivers:
Concentrated Solar Power Open Source Initiative (CSPOSI):
The solar cooking wikia:
DIY solar Site: