Harry Potter - J. K. Rowling (STFU, I was addicted to the books as a child, the hype never really wore off)
George Orwell, 1984
Ray Bradbury, Fahrenheit 451
Jonathan Swift, Gulliver's Travels
Daniel Wallace, Big Fish
Bob Greene, Once Upon a Town: The Miracle of the North Platte Canteen
Tom Stoppard, Rozencrantz and Guildenstern Are Dead
William Golding, Lord of the Flies
Anything by these authors:
J.R.R. Tolkien (besides The Silmarillion)
Jules Verne
H.G. Wells
Cory Doctorow (Highly suggest looking for stuff by this guy. A lot of it is free on the internet so take a minute and look some up.)