I did some googling, but all I found was that they would be great at cooling computer systems in space.
When you're sufficiently advanced, cooling your systems, technically disposing of entropy, is one of the main limiting constraint on your system. Also if you throw matter into a black hole just right you can get its equivalent (or half its equivalent I forgot which) out in energy.
Edit: thinking about it, it is half the mass.
Also if you throw matter into a black hole just right you can get its equivalent (or half its equivalent I forgot which) out in energy.
Not in useful energy, if you're thinking of using Hawking radiation; it comes out in very high-entropy form. I was so sad when I realized that the "Hawking reactor" I'd invented in fifth grade would violate the Second Law of Thermodynamics.
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