Touchscreens are great for passively browsing, as Scott Adams noted:
Another interesting phenomenon of the iPhone and iPad era is that we are being transformed from producers of content into consumers. With my BlackBerry, I probably created as much data as I consumed. It was easy to thumb-type long explanations, directions, and even jokes and observations. With my iPhone, I try to avoid creating any message that are over one sentence long. But I use the iPhone browser to consume information a hundred times more than I did with the BlackBerry. I wonder if this will change people over time, in some subtle way that isn't predictable. What happens when people become trained to think of information and entertainment as something they receive and not something they create?
Because we run an entire network of websites devoted to learning by typing words on a page, it's difficult for me to get past this.