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Magnetic Levitation
Magnetic levitation, maglev, or magnetic suspension is a method by which an object is suspended with no support other than magnetic fields. The electromagnetic force is used to counteract the effects of the gravitational force.
Earnshaw's theorem proves that using only static ferromagnetism it is impossible to stably levitate against gravity, but servomechanisms, the use of diamagnetic materials, superconduction, or systems involving eddy currents permit this to occur.
In some cases the lifting force is provided by magnetic levitation, but there is a mechanical support bearing little load that provides stability. This is termed pseudo-levitation.
Magnetic levitation is used for maglev trains, magnetic bearings and for product display purposes.
How Superconducting Levitation Works
http://www.youtube.com/watch?v=Z4XEQVnIFmQ
Superconductor Levitation
http://www.youtube.com/watch?v=nWTSzBWEsms
Magnetic Levitation
http://www.youtube.com/watch?v=SVTDALl2Eg8
Diamagnetic Levitation
http://www.youtube.com/watch?v=m-Al7GAnH8Q
Links:
Magnetic levitation - Wikipedia
Meissner effect - Wikipedia
National High Magnetic Field Laboratory
wondermagnet.com
forcefieldmagnets.com
otherpower.com
HFML, Levitation