Originally posted by Symmetric ChaosPlenty else.
He managed to take out a WhiteMartian by attacking the lower brain functions. Other than that I don't know if he's used it on much else than fish though.
In terms of other heroes/villains, he used his telepathy successfully against Steel, Vixen and Dr. Polaris. He's gotten into Martian Manhunter's mind without him knowing, aswell as providing telepathic backup for him many a times. He's taken control of an unconscious Superman's body. He's affected a Millenium Giant (who were previously thought incapable of affecting). He's made contact with the first inhabitants of the universe. And he's affected various alien lifeforms over the years, most notably (as you mentioned) taking out a White Martian.
He's not on J'onn's level, but he's a formidable telepath.