To the Folks who mentioned The Fountainhead and Into the Wild, both are very good books, enjoyed them immensely(also found Rand's view while too rigid, to an extent true).
Since I haven't seen a anyone mention him yet, any Ray Bradbury, especially 451 should be read.
Since "Into the Wild" has received some attention on this post, I'll recommend a couple of Krakauer's other pieces of work that are pretty darn good "Into Thin Air"- about the '96 Everest expedition gone bad (he was on it), and "Under the Banner of Heaven" which focuses on Mormon fundamentalism...