Nokia has filed a patent for a new kind of pointing device meant mostly for gaming. They have received the patent to make a mobile joystick. Here's the quote from the patent application...

"A method for integrating a pointing device into a handheld device, the method comprising the steps of: rotatably mounting a ball within a socket defined by said handheld device, said ball defining an orifice for receiving a stylus, said socket being configured for generating to a processor of said handheld device electrical signals indicative of movement of said ball in response to movement of said stylus; and imparting pointing device logic to said processor for responding to said signals."