I see that Shroud and Josh has mentioned micro black holes. What use will Miniature black holes be to humans i?

Well They only last for milliseconds because even black holes "evaporate"..They are created as a by product from the collision of particles when trying to find the Higgs Boson. As of yet it would take a black hole with the mass of the moon to be stable for a good amount of time.(the smaller they get the faster they "evaporate"). So with todays technology it could be done but it would take a Collider the size of Jupiter if not bigger to smash enough particles together at once to have a "stable" black hole. . Note: A black hole with the mass of the moon would only be about 2milimeters circumference. The Earth would be about the size of a centimeter.

For the past 15 years, Black Opps Six priorities. 1 - Anti Ballistic Missile Shield 2 - Technology that cancels gravity (no radar signature) somewhat like a "cloaking device". 3 - Using the wind, converting it into power in aircraft, absorbing wind along the entire front edge of the wing. 4 - Technology installed in drones that detects buried or hidden explosives over a wide area. 5 - Laser Death Ray for aircraft, ground artillery / tanks 6 - Fire and forget weapons for ground troops. and satellites.

I have nothing further to add so I will show you something opposite and awesome: http://phys.org/news/2011-01-astronomers-mass-largest-black-hole.html#nRlv

Lots of ways gravity could in theory be converted into energy. You could in theory take a few magnets and put them around something with a lot of gravity. Speed them up so they stay in a "orbit" around that gravity sorce. They will spin around it at very very high speeds for long periods of time until they are stopped by another force. You could then in theory wrap a copper coil around the orbit path of the magnet and presto you have a generator. Granted it would much more complex then that.. High gravity objects could also be used to manipulate things.