The spread of E-Readers has made information and material reach a wider audience, but there are several areas in which E-Readers might not be able to achieve this effect.  Here are the limitations of E-Readers in subject breadth.

• Poetry
  While some poetry is becoming available on E-Readers and in the form of E-Books, many current poets are hesitant to publish their work with E-Readers.  The fact that poetry is already difficult to publish means that poets are very loyal to their publishers and agents.  Additionally, the aesthetic qualities of poetry, such as type size and font, line length, and spatial arrangement on the page, make it difficult to move from a paper to an electronic format.  Some poets do not like the idea that the reader will be able to control for these things, as it might remove some of the original artistic intent.
• Experimental writing
  Many newer experimental novels, graphic novels, and artistic books will also be difficult to move into the electronic format.  The limited size of E-Readers and their customizability by the reader makes it difficult for these writers to convey the effects that they wanted to achieve in their work.
• Textbooks and scholarly writing
  Scholarly writing and textbooks are other areas that might prove difficult to be made available to E-Readers.  Many of these books have detailed figures and graphs that would be hard to translate, and still others are in incredibly narrow niches.

Despite these current limitations, the continuous technological improvements to E-Readers might make them a popular format for writers in the near future.