Electronic Publishing / Ebooks are the latest in thing and many companies and individuals are cashing in on the craze.
While e-book readers started it off now then it was the tablets and the iPad is still a good choice however with the bigger and bigger screens on smart phones many see a dedicated E-Reader as unnecessary.
I beg to differ as your phone can be a pain to read in direct sunlight and because they are backlit like your TV of Computer Screen reading on them before you try and go to sleep can make it much more difficult to get to sleep.