SolarMission Solar Tower Video:  "SolarMission Technologies and its Australian subsidiary, EnviroMission Limited produced this 5 minute video about its early pilot plant in Spain. It is an older video (2000) but gives a basic understanding of the solar tower concept."  Very effective story.
  4:57:54 PM    

About Parabolic Trough Solar:   Solid review of the field, from Sept 2005.
  4:41:18 PM