A very interesting post from journalist David Bauer. He has been reading books all his life, but after only two years of reading on an ipad, he is no longer comfortable reading a book the old-fashioned way.
I find it increasingly uncomfortable to move my eyes from the top of a page to the bottom as I read along. I prefer to keep my focus at roughly the same spot and to move the text rather my eyes.
Read his entire blog here: The Day I Forgot How to Use a Book