Combining simplicity with functionality, Readlapse is the speed reading app that will help you improve your reading speed. The interface is unbelievably simple and intuitive and focuses on only one thing: reading. You can change the background and text colors, the reading speed, and the chunk size (the amount of words that appear on the screen at one time).
You can also read .epub files, of which there is a copious amount on the internet. You can read most classical literature for free this way! You can also paste in some text to read quickly.
All of this is currently free: just download the app and enjoy!
Readlapse also works on the iPad.