Medium and Small Scale Concentrated Solar Thermal Power Platform
Open source project for concentrated solar thermal engine :
Zenman Energy (look into what they have done recently, seems promising, hope it didn't dissolve)
Companies working on small scale solar concentrator power:
http://www.mss-csp.info/cms/front_content.php?idcat=12 (Dead Link)
There are useful links to Documents - papers and projects, with contact names, such as
http://www.mss-csp.info/cms/front_content.php?idcat=80 (Dead Link)