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NGC 3132 (Eight Burst Planetary) looks very good in O-III.
The Blue Planetary is small and often missed as it is in a rich star field but is worth the hunt.
Ghost of Jupiter is nice and big and looks totally different with O-III as do most planetary nebulae. It's close to the apex of a long baseline isosceles triangle halfway along the snake in Hydra.
NGC 4945 is a big galaxy not too hard to find in Centaurus near Zeta Centauri. Look for a much fainter galaxy inside the same triangle that NGC 4945 is located.
NGC 4103 is a small open cluster that looks like an arrow and kind of points to the Jewel Box which is another 'must see'. It's on the opposite side of Crux as the Coalsack.
Eta Carina is a must with low power and O-III filter.
Markarian's Chain of galaxies in Virgo. Member galaxies include M84 (NGC 4374), M86 (NGC 4406), NGC 4477, NGC 4473, NGC 4461, NGC 4458, NGC 4438 and NGC 4435. This is a really nice field of galaxies under dark skies.
Forget about the Horsehead with O-III as this filter transmits close to nothing in the H-Beta band.
These are just a few off the top of my head. No doubt others will chime in with more.
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