The New York Times has an article on the growing emergence of touch screen devices. Apple revolutionized the market for touch screens with its IPhone and created the perfect user interface for this small display. However, I'm not convinced that touch screens make sense for every application. It makes sense when you are acquiring information such as browsing the Internet, selecting a song or reading an e-mail, but makes less sense when you need to input data such as composing a message, writing a proposal or filling out a form. The touch screen is the least efficient method for entering data, whereas the keyboard is the most efficient. Even the pen is more effective for certain tasks such as drawing, capturing signatures and taking notes. In my opinion, a hybrid approach combining touch, keyboard and pen input would be the ideal user interface.