Josh Clark - Buttons Are a Hack A Virtual Seminar Follow-up
Touchscreen devices give you the ability to directly manipulate content. This allows designers to create interfaces where the content itself is the control. This lessens the need for buttons and can reduce the level of complexity within your design. The problem is making the user aware of the availability of gestures in your design. Gestures, especially multi-touch gestures, are powerful control mechanisms but useless if the users aren’t aware of them.