So, we have the Multitouch "Magic Mouse" from Apple and it works great. We have Multitouch on the display of iDevices. So I often thougt, when I hold the iPhone in my hands: it would be great to navigate through an webpage with Multitouch on the back of the iPhone. Try it out. Hold your iPhone and one hand and try to virtual scroll with your forefinger through an webpage. What do you think about that feature?