Though it is still early in the migration process, Apple's iPad and other tablets appear to be a very good thing for the publishing industry, allowing publishers to monetize their content while avoiding the printing and distribution costs associated with traditional print vehicles. And they've proved to be very good for consumers, offering improved convenience and portability, not to mention the ability to read in the dark.

The best app editions provide expanded service to their readers, making it easy to share articles through email or social media, find or buy products that are featured or advertised, and compensate for disabilities with larger font sizes and audio.

But there is a large problem that threatens to limit publishers' opportunity.

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