I broke down and bought one of them callous scrubber things at WalMart.... but I ain't ever used it. I need to during the summer though.... I just don't.
I soak my feet in Aveeno bath and warm water, then scrub with the pumice stone, then slather with lotion, then either put on my socks and shoes or put on a pair of socks and go to bed.
My feet still get dry looking when I wear sandals, but at least they aren't painful like before.