The new 3GS iPhone has a coating that helps you leave no, well hardly any, prints-fingerprints. The glass screen is coated with a polymer, a plastic that human skin oil doesn't adhere to very well. People in the chemical bonding business like to call the finished surface "oleophobic."
Such a lovely Greek cognate may sound like it means "afraid of oil." And, it does, but it also connotes (or carries with) "aversion" or "not-like-to-be-around-tivity," if I may. Instead of sticking to the bonded-plastic surface of your new phone, the oil from you fingers or cheekbone or tip of your nose stays more or less together as its own smooshed droplet.