Squirrel ribcages with guts intact, bullfrogs, catawba worms, mussels, bullheads, etc. Just depends on where I'm fishing, what species, time of year, etc.
Oh yeah, and when I can find them, my favorite is great big live crawfish. Flatheads love them. The only problem is that everything else loves them, too.
I read about Ivory and tried it on some jugs one night and it did catch fish Another hot thing right now is soaking your bait, like Chicken Breasts or Hot dogs in Cherry Koolaid powder and Garlic, I know a few guys that swear by that.