I got given a half a dozen books from the Penguin Great Ideas series for Christmas. These books are bloody brilliant, notably for the content, but also for their magnificent covers. Check out the Great Ideas microsite for more, they really are amazing. For cheap paperbacks — £5 each at retail — they are a no-brainer.
I've just finished Books Vs Cigarettes by George Orwell, and I'm currently plowing through Dostoevsky's The Grand Inquisitor (I read The Brothers Karamazov at uni but forgot most of this). Bite-size and brilliant, who needs a Kindle?