(YouTube Link)
Researchers are Carnegie Mellon University are developing touchscreens that are textured to provide a variety of different shapes for users to interact with. If I understand this video correctly, this is more than just a shaped screen. The buttons on a single screen can actually change shape to present different types of interfaces. This technology could be very useful for the visually-impaired or people who want to use a machine while looking at something else.
http://www.popsci.com/scitech/article/2009-07/your-next-touchscreen-might-come-inflatable-buttons