The (unreplicated) results (by Eugene Podkletnov, Ning Li, Martin Tajmar) might indicate that GR is broken (entirely possible, and replacements have been proposed), but not necessarily that useful applications can be devised.

How it supposed to disprove antigravity theory, any of them?

For the past several decades, highly classified aerospace programs in the United States and in several other countries have been developing aircraft capable of defying gravity. One form of this technology can loft a craft on matter-repelling energy beams. This exotic technology falls under the relatively obscure field of research known as electrogravitics."

and for cold fusion we'd have to make them, investing energy.

No. The simple Magnetic & Electric Repulsion can create an antigravity and electro Magnetic flight. For exmple "hot air balloon" (an early form of anti-gravity) can rise up through the Earth's atmosphere... Using "Electricity "for fuel, which requires "super-conductivity" for efficiency, and "batteries" as "fuel tanks" to hold the electricity necessary to start it's "solid state electronic motors"

It Would be possible to construct a craft with small enough propulsion power requirements that interstellar travel could be achieved.

Here simple explanation A crsft that when in flight, can generate all the electricity it needs and recharge its batteries, just from its motion... A craft that once outside the Earth's atmosphere, flies at electromagnetic speeds.

If you believe or some other abstract theory, you will never understand antigravity or electro-magnetic craft... It is necessary to understand gravity as a simple electro-magnetic force, to understand the principles of antigravity and electro-magnetic craft.
It all by manipulating!

same as x-ray were a hoax 150 years ago 

You are totally right in the perpetual motion machine because it violate the known laws of physics...but the gravitomagnetism with serious study will opened up unexpected domains.

Power generators and electrical motors can highly benefit for gravitomagnetism experiment.  Then the effect in frame-dragging would be magnitude greater than predicted by relativity. The fields are extremely small. It is possible to produce artificial gravitational fields within the standard equations of relativity and we only need mass the size of a neutron star to do it.

I explain to but you seem repeatedly answer the same doesn't work.
The necessary existence of a gravitomagnetism field has been well established by physicists specializing in general relativity, gravitational theories, and cosmology. But, the existence of this field is not well known in other of arenas of physical science.

Superconductors could affect the force of gravity.
Okay...this is out of topic regarding the book i read "Secrets of Antigravity Propulsion".
Here the more easy for you - NASA’s Ron Koczor and Tony Robertson of NASA Glenn research center, who performed tests on a superconductive disk designed by Podkletnov and built by SCI Engineered Materials. However, the replication achieved only 200 rpm of the required 5,000 rpm and failed achieve a measurable result.
Now i told you considering of DARPA, DoD, and other secrect project, antigravity was develop long time ago as this is weird science and disruptive technology
I don't doubt for a second that the person on link i gave you work is real and they were disappeared.

There was this article that I've found in regards to Ron Koczor. This does not support anything that you've said. Boeing did not do any research in this field. Nor did the experiments work. More money sunk without any results.
http://www.slate.com/articles/arts/brave_new_world/2002/10/feeling_antigravitys_pull.html

Both the "Magnetic principle" and the "Weight into Speed" devices will, if built right, run for many thousands of years!

B-2 Advanced Technology Bomber electrostatically charges its exhaust stream and the leading edges of its winglike body. Although these disclosures were framed in the context of enhancing the B-2’s radar invisibility, in fact they are part of an electrogravitic drive capability. West Coast scientists and engineers who were formerly associated with black research projects, which are defense research projects that are so secret even their very existence is classified. Northrop, the prime contractor for the B-2, had been experimenting with applying high-voltage charge to aircraft hulls since at least 1968, when at an aerospace sciences meeting held in New York in January 1968 scientists from Northrop’s Norair Division reported that they were beginning wind tunnel studies on aerodynamic effects of applying high-voltage charges to the leading edges of high-speed aircraft bodies. Similar research was carried out in 1965 by the Grumman and Avco corporations. Interestingly, in 1994, Northrop bought out and merged with Grumman.

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Added on April 3, 2012, 1:19 pm

Because NorthropCorp didn't mentioned about the gravitational field when it maneuver in stratosphere. This their secret. Normal thruster during take off and there are something weird in stratosphere level.

This picture is a photo retouching, ever since digital software can to wonders, many artist and photographers alike created a lot of publicity for themselves like capturing ghost / god, UFO or what ever... It is easy to become paranoid if you yearn for mysteries and everything will become a conspiracy.

I know it could be real but also fake night vision effect too, my suspicious is the glare, the characteristic of infrared interpreted image does not glare it only glows and the picture shown is light and shadow of the sun, clouds don't appear in night vision like that.