Instructables

http://www.instructables.com/id/ICARUS-The-Analog-Heliosat/
Using clockwork: http://www.instructables.com/id/HELIOSTAT/
Using Arduino to calculate where you need to point: cerebralmeltdown.com
A complete history of Heliostats: http://www.redrok.com/main.htm#mechanical
Commercially available: http://lightmanufacturingsystems.com/order/
Category:Heliostat
Category:Energy
Category:Solar tracking software