Ditto on the frogs and shrimp. Frogs can really stay on the hook well, too. A friend of mine racked up 11 'cats on the same frog one night. Mind you, towards the end he was stirching parts together with a smaller hook and some light monofilament.
Up here in South Dakota the channel cats are much more finicky, they rarely lower themselves to a stinky bait, preferring the fresher shrimp. (50-60 shrimp to the pound are about the right size)