[NorthernSanctuary]

This one looks real and working. Claims to scale up to any level of power.

Introduction:
http://www.youtube.com/watch?v=LFu-s...eature=related

Demo:
http://www.youtube.com/watch?v=LgEsS...eature=related

http://www.youtube.com/watch?v=7S1aA...eature=related

website:
http://www.witts.ws/

Other claimed technologies in the works:
http://www.witts.ws/technologies.html