Working with multi-touch assignment has been an experience in going beyond the traditional media on using the mouse. When more and more emphasis is switching from single user experience to social gather having multi-touch aspect certainly has important aspect that the user can utilize to create more human interaction.
Here are some example of forward looking technology that utilize multi-touch.
http://nuigroup.com/forums/viewthread/5074/
http://www.istartedsomething.com/20090317/razorfish-davinci-surface-application-rayon-physics-deluxe-better/
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