Well we must accept that we are in a new world now where the GUI has become TUI (Touch User Interface) and this got hugely popular by the adevent of the iPhone:
Here is a video of the presentation that eminent interaction designer Dan Saffer gave in the NYC IxDA meet few months back. This presentation is about TUI ie; Touch User Interface and is called “Tap is the New Click”. Pretty interesting presetation. Please watch it sparing some time as it is aprroximately more than an hour.
watch the video here: http://vimeo.com/2761844