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I recently found out that a PET scan stands for a positron emission tomography. Are there any other practical uses of antimatter in the present?

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As a practical matter, it is very hard to confine anti-matter (for obvious reasons). Therefore its commercial uses, so far, are limited to ones in which it only used in a passive manner - as in the +ve beta decays of PET. And PAS, mentioned in the answer below, belongs to the same category. So the answer to your question would seem to "no other uses" at present. – user346 Dec 30 '10 at 7:38

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I don't know if the other antiparticles have been exploited, but positrons are used in metallurgical studies. Positron annihilation spectroscopy is one particular application.

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I don't know if this counts as "practical", but antiprotons are used in the Tevatron to increase the center-of-mass energy of collisions with protons.

In the LHC, however, the rest-mass is so much smaller than the Lorentz-boosted mass in the center-of-mass frame, that it basically isn't worth the hassle of using antiprotons.

This may just be a quirk of historical naming, but anti-neutrinos are typically much more common than neutrinos, since they are formed via beta-decay, which is happening all around us all the time.

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Anit-neutrinos from reactors, neutrinos from the sun, and both from cosmic rays... – dmckee♦ Dec 30 '10 at 21:35

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