A history of bio-eletrography - or Kirlian photography - how it's used in research, and the latest efforts to understand it and use it for clinical applications.
Good info and photos on Kirlian photography, otherwise known as corona discharge electrographic imaging technology. They also sell equipment.
Good background article with history but, alas, no photos.
Skeptics: Kirlian Photography
What is actually recorded, say the skeptics, is due to quite natural phenomena such as pressure, electrical grounding, humidity and temperature.