power storage - think about it... current induced in a SC loop directeded by magnetic fields can last infintely (SMES -superconducting Magnetic energy storage)
hypothetically, power transmission(hasnt really been applied yet)
more effecient motors and generators
josephson junction ie current can pass through an insulator btween 2 supercondutors... useful as a highly sensitive and fast switch.
-used for SQUID(Superconducting Quantum Interfering Devices) which can b used 2 map atommic structure and eaths magnetic fields
-also can contribute 2 future development of tetraflop computers (though alternate paths seems more likely)
MRI in medicine
also a major disadvantage 4 superconductors is that HTSC which can operate by using relatively cheap liquid nitrogen r very fragile and unsuitable 4 many of the applications