Ross Rubin contributes Switched On, a column about consumer technology. Barring any disruptive portfolio shifts prior to its introduction, the Palm Pre will complete a new competitive handset dynamic that began with the introduction of the iPhone. Each of the four major U.S. mobile operators will be emphasizing a capacitive touchscreen smartphone. Curiously, none come from any of the top five global phone manufacturers. And even more curiously, each will be powered by a different operating system as the Pre at Sprint jockeys with the iPhone at AT&T, the
