I think keyboard/mouse -&#62; touch is, itself, a trivial change. If we're just tapping virtual keyboards and 'clicking' on program icons with our fingers, what has really changed?<p>I think the kind of paradigm shift Gruber was getting at, is away from things like hierarchical 'file' systems and proprietary application-centric file formats.<p>Personally I think the biggest missed-innovation in the iPhone SDK was not having Newton-esque app-agnostic shared data stores.