MG, I have found the Peppermint Cooling Pumice Foot Scrub (from the Body Shop) is REALLY good for cracked heels.....

I have had shocking cracked heels and scabby legs (when we lived in Darwin.....365 years in thongs, and moxxie bite scars!) and here is my method:

Use the Pumice Foot Scrub in your feet, followed by a cracked heel cream (I use Scholl). Then put cotton socks on. Repeat daily. I also use a foot scrub in the shower.....like a massive foot sized emery board to keep on top of dry dead skin.

For legs, I use a moisturising exfoliating cream with a loofah glove, then loads of sorbolene, daily.

HTH!