I used to have a big problem with heel cracks, where if I ignored them they could continue to crack to the point of bleeding and causing pain with every step. Now I soak my feet in warm water once a week, and then while they're still wet file the edges of my heels with a big old metal file from the hardware store (I'm so hardcore pumice stones just break on me). If I get lax and any cracks still turn up, then right before bed I put lotion on them and then a piece of duct tape to cover -- lots cheaper than bandages, keeps the lotion in the cracks and off the bed and the floor, etc., and is kind of amusing.