For example, I don't keep any sort of calendar on my desktop machines in spite of On The Ball being the best of them. Nothing special, a lot of the time I'm not at my desk. Since my calendar should be where I am, not on my desktop, wherever that is, I keep my calendar in an obsolete Casio organizer, the BOSS SF-5980. It sits in my pocket until I need it wherever I am. A calendar must be available at the point of need, at any time, at any place.
Users get new capabilities and developers get new markets.
For example, there has never been a real Amiga portable. Let's bag the laptop and go straight to the palmtop. I would love to have something that would run Scala MM400 and fit in my pocket. Or a Java version of it. Somebody should tell them.