Here you go.
http://www.agrisupportonline.com/Articles/cracking_in_tomatoes.htm
I don't have a problem probably because when my tomatoes start to ripen I pull them and finish them off on the window sill, or porch railing, they still taste way better than anything you can buy.
My family has always gardened and I was taught by my grandparents and parents. They told me that the plants would produce more if you pulled them, so that is what I do. It also keeps the weight off the vines so they don't break. Chris