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Some days ago I posted this link: http://www.billbuxton.com/multitouchOverview.html These word sum it up for me:

"In making this statement about their awareness of past work, I am not criticizing Westerman, the iPhone, or Apple. It is simply good practice and good scholarship to know the literature and do one's homework when embarking on a new product. What I am pointing out, however, is that "new" technologies - like multi-touch - do not grow out of a vacuum. While marketing tends to like the "great invention" story, real innovation rarely works that way. In short, the evolution of multi-touch is a text-book example of what I call "the long-nose of innovation.""

The link also provides a nice overview of the history of touch.