e-books

Books in the paper form are now facing competition from books in an electronic format. (eg. this book)
At the time of writing, sales of e-books have been slow and below expectation. I suspect this is due to the lack of advantages being offered by the currrent string of e-books. To be more specific, the current crop of e-books that I have seen are written as if they are print books and are simply packaged and distributed electronically.
Typically when a new form of technology is offered, it mimics the technology that it replaces. Currently, e-books mimic paper based books.
This provides advantages for easy distribution via a website etc. however it provides very little advantage for the reader given the quality of computer screens and the difficulties associated with extended reading from a computer screen. Given that a desktop printer prints around 300-600 dots per inch and a computer screen only displays at 72 lines per inch, there is a distinct quality difference.
However, the key advantage for an electronic book lies optimizing the digital form of the book. This includes linking and searching.