Ross Rubin contributes Switched On, a column about consumer technology.
Not every company producing smartphones cares much about other kinds of portable devices, but those that do can heed a lesson from Apple. By leveraging the popularity, platform, and distribution of the iPhone, Apple deftly created the market for iPod touch applications. One would now be hard-pressed to name another non-cellular handheld device that has access to as many modern applications as Apple's flagship digital media player. Under some definitions, it has become the first mass-market Mobile Internet
