That Electrogravitics link is good, I include a quote from the page. The author recommends a book called Secrets of Antigravity Propulsion, by Dr. LaViolette, which I have found is an excellent book on the subject. (torrent link or other)
The page author also suggests handing over your signature/identity to the US military, declaring your interest in a suppressed technology, which is effectively what you would be doing by signing a petition. I would not recommend that, the US military have a history of eliminating those who develop these technologies, why do their intelligence work for them?
Quote from the page re: electrogravitic overunity device...
"If, say, four devices were placed on a cross, each oriented 90° to the center and pointing in the same direction relative to that center, and a shaft was set at center and into a generator, when small amounts of energy are used at high voltage on the units, the resulting rotation will induce a greater output at the generator than the input to the units. Overunity (as energy is drawn from the zero point field) is achieved."
Trevor James Constable/ Orgone Weather Engineering:--
-Orgone Weather Engineering
T C Lethbridge/Consciousness and the Paranormal/The Power of the Pendulum--
-T C Lethbridge
A version of the Joseph Newman Energy Machine, by JL Naudin
The Newman machine works on Voltage, not Current, and once a working version is made, a considerable amount of torque and Voltage is produced.