Dan Saffer has published an interesting article illustrating the Activity Zones for Touchscreen Tablets and Phones which appear to provide the most natural level of usability.
The article is particularly interesting in that it touches on (pun intended) the human factors involved in how we physically interact with devices. The Activity Zones outlined in the article equate to the areas which provide the greatest level of physical comfort when interacting with a touchscreen device.
The general physicality of natural, symbolic and sequential gestures associated with designing touchscreen experiences as well as the environmental distractions and engagement models of mobile experiences is a topic which I find quite interesting. This is a significant leap forward from the traditional WIMP interaction model. All of these considerations allow for a more Human centered design focus, just as it should be; after all, this is the purpose of UI Engineering.
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