Can antimatter ever be contained and utilized? I know it can be stabilized, but can it be put to good use?

Answer 1

This is theoretically possible: It's possible to contain a plasma of antimatter with a magnetic containment system. If you had enough antimatter available and you had a controlled way of combining antimatter with ordinary matter, you could hypothetically use the energy released as gamma rays in the annihilation as an energy source.

I'm not sure if this is technologically feasible, but if it is, it could be a very useful source of energy for spacecraft.

Update:

I've found some web pages about antimatter drives. There's at least one company doing research in this area and NASA is considering antimatter drives as a possible propultion system for deep space.
http://www.orionsarm.com/ships/antimatter.html
http://ffden-2.phys.uaf.edu/213.web.stuff/Scott%20Kircher/plasmacore.html
http://www.space.com/businesstechnology/technology/antimatter_sail_021029.html
http://www.universetoday.com/am/publish/positron_drive_pluto.html

Answer 2

there is no use. making anti-matter costs energy. when you anialate anti matter and matter, you get that energy back so your back to the begining with what you started out with.