Maglev train is the frist that comes to mind. There are two types: EMS and EDS
EMS (electromagnetic suspension system) uses conventional electromagnets to provide the levitation. this is used in Germany.
EDS (electrodynamic suspension) uses superconducting magnets. The Meissner effect is used to levitate the train about 10mm. The Japanese maglev is an EDS.
For more info check out hsc.csu its got a couple of good links or just use wikipedia.