I work in food service and spend a lot of time washing my hands and dishes (and then dunking dishes in a santizing solution that's even more drying!) and my skin, which never used to be dry, is cracked and all dry now too.
I love love L VE our parrafin spa. I use it twice a day - once right before I leave for work and then again when I get home from work. In between, I use Cocoa Butter or Shea Butter (whichever's cheapest the day I'm shopping) whenever I feel I need it. Or whenever the bottle's staring me in the face. I just like moisturizing, even if I don't necessarily need it.
For cracks, Vitamin E oil seems to do the trick. Just massage it into the cracks at least once a day and in a short while, they'll be gone. It's an amazing overall moisturizer too, but it comes with a hefty price tag if you're just buying the oil. (You can also buy the gelcaps of them and pierce it with a safety pin and squeeze the oil out. My local pharmacy has bottles of the oil, though, and I find that to be more economical.)
And of course, never forget the wisdom of soaking in a tub of oatmeal when you had the Chicken Pox or a really bad sunburn. An oatmeal handbath softens the skin like nothing else. Which always feels good. Sugar with olive or mineral oil works as a nice and gentle exfolliant too...
I think I've said more than enough to proove I'm a little bit obsessive about this, in any case... :walks away slowly: