Cast iron was a main cooking staple for hundreds of years until the advent of non-stick materials. Now that people are understanding the potential health hazards of teflon, more and more people are remembering the benefits of cooking with cast iron. Cast Iron spreads heat evenly across its surface, cooking more consistently. It's also naturally non-stick and easy to clean and care for.
In addition to the health benefits of cooking on more cast iron there is also the benefit of added durability. Cast iron is a tough material and when cleaned and seasoned properly can literally last for generations.