I'm awful at reading books quickly, which usually results in me not finishing them. Between the internet and well... the internet, I have enough media to keep me intrigued when I'm at home or in my dorm at college.
However, when I'm separated from all that, it becomes much easier for me to read.
When I was in Peru for two months with no available or crappy tech, I managed to read through Ayn Rand's The Fountainhead which is quite the behemoth in under three weeks.
(If your wondering, I read it because of Bioshock, thought it was amazingly intriguing at the time, loved how addictive the writing was, understood the metaphorical significance of the sexual content, but still thought it was awkwardly handled, and several months ago debunked its theory as humanism bastardized by neoliberalism which amounted to a wet dream for the return of oligarchy.)
Besides that, I've only managed to read the first three books of the Hitchhikers Guide to the Galaxy and Money Secrets by Dave Barry.
Everything else has been mandatory school reading. I still enjoy reading, its just that its hard for me to dedicate enough time to reading anything that doesn't have me either totally intrigue me or make me laugh a lot.