Someone has probably posted this forever ago...
but I recommend grabbing the free Kindle for Android app. Then go nuts downloading piles and piles of classics for free.
War and Peace, Frankenstein, Life on the Mississippi - there are thousands - all free. App works well, low battery use, uses whispersync. Can customize font sizes, brightness and background (Since I have a Captivate I am using lowest brightness with black backgroud/white letters - battery lasts forever).
Not exactly an unknown app, but works great, free, etc. I enabled one-click buying and am having dozens of classics on the go by just one click at Amazon.