Each week Ross Rubin contributes Switched On, a column about consumer technology. Part II of this article will be coming next week -- stay tuned! The rise of smartphones hasn't been kind to makers of devices such as digital cameras, digital music players and portable GPS devices. Handsets with a rich selection of apps have been increasingly cannibalizing sales of these products, leaving few ways for these once hot holiday gift items to compete. In some cases, though, they have enabled functionality that was once envisioned for standalone products that either failed in the market or never went much beyond a niche audien
